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Hi Peter!
That's a very impresive mount you've made there..I've built a few around my 10" dob and the tricky part is getting the altitude balance to agree with a variety of eyepieces, etc..I've built a cradle to hold the optical tube which sits on ball bearings..as this provides a very smooth motion it also has a friction dampening wheel which has adjustable tension via a threaded bar and locknut which pulls a spring that is attached to the flatbar holding the friction wheel.
The friction wheel is just a large rubber washer which has a metal sleeve and has a metal washer on each side..this is mounted on a hex headed bolt...a compression spring sits next to the metal washer and another washer on the other side of the spring...all that's required is tighted the nuts against the spring to the required speed control when the wheel is placed against the altitude hub..(only slight resistance is needed to hold the scope)
Mount this on a piece of flatbar and adjust the amount of tension against the hub as described earlier..this set-up will give a wide range of adjustments..but you should be able to find a setting which cover a wide variety of eyepieces.
Cheers!
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