Re: Model A
The repro starter switch contacts are made from copper, which isn't as springy as the original, which were made of a brass alloy. Sometimes a spark will arc between the stud on the starter and the contact in the switch during operation and it can fuse the two together. The brass originals may (or may not) have enough spring to break the contacts free when you let go of the switch, but the copper repros won't be able to do it. Make sure the contacts are clean and polished- it can reduce the chance of arcing and fusing. If you can find an original brass contact, use that. The brass has a more yellow color. The copper repros are pinker.
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