Here is the dob's side view showing one of the knob's for the tension screen. It's well balanced without them, I purchased it second hand, the teflon looks, like it might have been cut a little bit on the altitude to increase friction. I do notice when I mount both the finder and a telrad it's a bit out of balance. I am more of a telrad person and I can always add a fan or weight to offset things a bit. But, it works just fine as is.

Here is the underside showing the pivot bolt in place, the four holes on the corners were pre-existing, no clue what they are, don't really care. I would smooth and fill them if they bothered me, I figure more holes, less weight to carry.

I turned the tube to the point where the side of the tube reaches it's lowest point to see how much room I had for the encoder mounted on top of the new pivot bolt, not going to be a problem at all with space, I can easily still add a fan if I want to. I placed a VHS box for some perspective in scale.

This is the Alt placement, it's a bolt with a knob on the end for the tension springs. I don't really need the springs, everything is pretty well balanced and have some decent friction to hold things in place yet still fairly easy to move around.

Side View

Bolt Removed

Bolt

I am going to hit the hardware store and see what type of bolts they have in stock and maybe get creative. If I cant find anything suitable, I can bond some type of 1/4" bushing to it and tap a small hole for a set screw. (and make a backup just in case)