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Tried to make one of them using tight hinges but there was too much slop
in them. Thought about trying to use some kind of very thin flexible
metal or spring steel sheet but that stuff is difficult to work with and
reliably drill accurate holes. Might be able to get away with a flexible
plastic or Teflon sheet. Ended up with with this focuser (see pic) which
has about a 110mm range.
Cheers
Stephen
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