Here are some key parts that we have been discussing and that have been made by Luigi and his brother.
They look great.
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Hi Tom.. 

Here some attachments to reply to the reflector about the discussion you can see below.

Me with my brother we started experimenting about the reproduction of some plastic parts to restore old keys. We tried with success the replica of the HIMOUND BK-100 paddle that fits as the original when replaced..Even the look is perfect. We obtained it with a mold and an overcasting on the pre-built brass calibrated bushings, realized on a lathe.
we're trying to obtain the transparent covers too.

We made some replica of the amplidan key covers too and we're working on the plastic base to realize spare parts for this kind of keys.

During these experiments we tried also to make replicas of different knobs, to give replacing parts of the broken original knobs or to give some option for those who prefer different shapes....

If Someone is looking for a particular piece for a restoration we can evaluate how to realize it and contact me on my email.
Regards. Luigi IZ4KBW