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Thanks for the info. Shoot. I am definitely steering clear of glue.
Can you give me a better idea of what kind of silicone would work? I am not even sure how to search for it to buy.
So is there really any harm (other than aesthetically) not having something in top of it?
Above is the sheet of silicone I bought to use to make small spacers, that I put on top of the glass button, and was recommended by Jeff. It’s TOO THIN, to use by itself, without the glass button, but I’m sure there are thicker versions available. At least on the version I linked to, one side of the silicone pad, has some thin self stick adhesive that can be rubbed off, I wanted to be able to remove it when desired, and was unsure if the adhesive would get too hot when a VC was pressed down on it. Since you would be using it to REPLACE your missing button, you would would need a THICKER piece. I can’t access the button on mine to measure my button thickness with calipers, but the button is probably 2-3mm thick. Jeff could answer that.
I’ve read on other IH units, sold by others like Pipes, that some use CORK, as a spacer over their switch. I would think any hard material without being glued may wobble a bit, as the switch in the FD is not perfectly flat. But a thick silicone pad should work. This is what I may try, if and when my button comes off again.
The reason there is a button on top of the switch, was to potentially protect the switch from any excess heat from VC cap, and it creates a flat surface. I’m not sure if using the IH without anything on the switch, would eventually be bad for it, though it does work. Without any spacer or glass button on a naked switch, also means you would probably have to adjust the coil itself, to compensate for the now lower sitting VC depth, the DEEPER the VC goes into the coil, the SLOWER the cap will CLICK. Jeff adjusts his coil to the appropriate depth with his glass spacer installed. Another reason, if you are not comfortable doing a coil adjustment, to let Jeff do it.
You could always email Jeff, ask his opinion, or consider sending it to him to re-glue a glass button on yours. I’m assuming he is still doing maintenance repairs?