Help with Vixen Alt-Az mount

I bought a used, older-model Vixen Alt-Az mount here a while ago and am using it with a 100mm achromat. It works, but needs more tweaking (I've done a bit of that already) to make it smoother and have less slop, especially in altitude. I think there's something wrong with the sequence of washers as they are installed but I've not been able to work out the correct sequence. It takes too much tightening to hold the scope stable, making smooth tracking difficult. Perhaps some parts are missing.

Can somebody provide an exploded diagram of this mount or some expert help for me? It does not have the counterbalance arm, and appears to be much like the Orion Alt-Az mount, with worm-geared fine adjustments on both axes.

-- Tom

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hey Tom

is your scope balanced on the mount? it looks like you have it mounted right near the focuser, which would mean it's out of balance if your achromat has a long tube (unless you're using a heavy star diagonal and eyepiece). if the scope is out of balance i would expect the mount to give jerky motions, especially in altitude.

hope this helps..

Steve