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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | By inspection of your pictures, I would recommend looking at the spacing on the switch. When you push the button, the coil activates and pulls the diaphram "up", which opens the switch, cutting off power, letting the diaphram relax and the switch to close again.
The tone can be controlled somewhat by the switch preload and depth. It looks like this one uses a collar on the diaphram rather than the nut that a lot did.
Does the diaphram post move smoothly in/out of the coil? | | |
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