Roger, pls send me a pic.  It could be that we're talking about two different parts.

  As an aside, I own a 1982 aircooled and I picked up a spare speedo at a VW show which seems to be earlier.  For one, the back of the speedo surround was metal (not plastic like my 1982) and furthermore, it was a screw-on coupling for the speedo cable (not push-on).

  If yours is earlier, you can have my speedo. :)

Roger Sisler <rogersisler2000@YAHOO.COM> wrote:
  I cannot see where to drill. I looked at an old auircooled speedo,today.A
cover of pot metal exists to cover this gear so it wont slide out of
position. I am going to fix this by gluing a piece of plastic near the
gear so it only has limited movement possiablities.

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