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Thread: New Element in a 1957 Hotpoint wall oven

  1. #31
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    semi-circular stem into the circular hole of the knob.
    I'm not sure what you mean by that. The hole in the knob for the thermostat shaft is usually "D" shaped. It couldn't be round or it would just slip on the shaft.

  2. #32
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    Sorry for being unclear. The picture will hopefully make it clear. The old thermostat has a round shaft and a second, flat one in order to lock the knob in place for calibration (calibration is done on the knob with a toothed wheel and screws). The new shaft is D-shaped. So the old knob just slides around the new shaft without really grabbing on. I don't want to replace the knob as that's part of the aesthetic of this oven, so I'm hoping there is an adapter I can either buy or make to lock the knob in place on the shaft.

    Click image for larger version. 

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  3. #33
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    Red face

    Sorry but I've never seen a control shaft like that original one. It must be even before my time.

    The final replacement universal thermostat did come with some extra hardware. I wonder if it has anything to do with the knob mounting?


    WB21X5212 Thermostat Pkg + accessories




    Dan O.

  4. #34
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    Oh wow, I can't believe I stumped you. The link above doesn't work for me - it just takes me to the home page. I've tried searching for it but it's not coming up. Could I ask you to repost it? I'd like to take a close look at the picture to see the parts.

    I was wondering if something like this might work - I could epoxy it in there and then calibrate the knob once it sets. What do you think?

  5. #35
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    Red face

    This page has similar pics of the control kit and accessories.

    LINK > http://www.appliance411.com/data.php?ap=WB21X5212


    that clip you linked to is for a dryer and their shaft sizes are considerably larger than GE thermostat shafts. It also fits into a knob that has a "D" shaped hole.

    Are the temperature calibrations written on the knob or printed onto the panel? I might be able to find a knob to fit the thermostat shaft but finding one with the temperature gradations will be difficult.

    Dan O.

  6. #36
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    Right, I know it's not the right part, I'm just thinking of something along those lines (that was simply the first thing I found that I thought I might be able to build into what I need).
    The temperature calibration is done on the knob using what I can only describe as a pin and teeth set up.

    It's not a fun job to get it just right, but basically you have to loosen the screws to turn the aluminum ring of the knob to lock in to the teeth of the knob. I've included a picture that shows how it's put together. I'm wondering if there's a spring insert that could replace the triangular one that would lock into the D shape. I'm not quite clear what this "spring" is actually for, but could it have been intended to be replaced based on the shape of the shaft?

    Click image for larger version. 

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  7. #37
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    Lightbulb Thermostat knobs

    I'm not quite clear what this "spring" is actually for
    I'm afraid i don't know either. It doesn't look to do anything unless it clipped into a horizontal groove in the shaft to hold the knob on??

    The size of a GE thermostat shaft is unique in the industry in my experience. I don't know any knobs besides ones designed specifically for it that fit onto that shaft size. Most control shafts are larger diameter.

    I found a couple of GE thermostat knobs that look to have the same temperature gradation as your knob and should accommodate the new control's shaft size but I don't know if the "D" shaped hole will have the same orientation as your control. That is responsible for having the OFF position at 3:00, 6:00, 9:00 or at the top at 12:00 position.

    Click image for larger version. 

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    LINK > WB3X5481 Thermostat Knob

    LINK > WB3X5638 Thermostat Knob

    I don't know what the differences are between them.

    The latter one is NLA but there are a couple of used one listed at the link below.

    LINK > WB3X5481,WB3X5638 Thermostat Knobs


    I don't know how you'd get the old knob to be used to on the new control if the knob's hole is totally round. That would require some ingenuity on your part.

  8. #38
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    So I went with the "ingenuity" route and it took about a week, but I think it's working. I basically clamped a small strip of middle under the metal plate at the back of the knob and that is now grabbing the stem effectively. Depending on which oven thermometer you believe, it's either exactly right or 50 degrees off. I suppose I need a third oven thermometer...
    Below is a picture of my jury-rigged solution. I have, however, wondered if this knob would fit as a more permanent solution. It's closer in style to what is on the oven and the right shape. Of course that doesn't mean it's the right size, but it might be worth a shot. (I don't know if there are parts manuals for knobs).

    This is my workaround:
    Click image for larger version. 

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  9. #39
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    Thumbs up

    wondered if this knob would fit as a more permanent solution. It's closer in style to what is on the oven and the right shape.
    That knob could very possibly be a right shaft size and the temperature gradations look close. I mainly looked at the 300 mark bring directly opposite broil. I can't tell about the orientation to the flat on the shaft.

    BTW Your solution looks fine if it holds up. Such an insert could be tapered so it tightened onto the shaft when pressed on. That might make initial installation simpler.

    Dan O.
    Last edited by Dan O.; March 24th, 2019 at 08:53 PM.

  10. #40
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    BTW of the used knobs at the "LINK > WB3X5481,WB3X5638 Thermostat Knobs" link i supplied previously there was one for $9 and one for $15
    instead of the $24 dollar used at your link. If you were going to take a chance, cheaper might be the way to go?

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