MGA Tachometer Gear

[gbaker@customcpu.com (Baker, G.)]

Here's one for you'all,
  Anyone ever take apart an MGA tachometer gear.  Mine turns with a LOT of 
resistance.....more than I think should be the case.  I expect I'd have to 
have some small pieces made or scrounged to make it right but don't want to
damage anything taking it apart.  A new one is very expensive and the gear and 
housing are in great shape.
Thanks,
Gregg Baker