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Ok.? I understand.

Sorry for the long winded comments following...

There are 2 directions the worm can move... That must be considered and minimized. ?one is the worm to ring gear spacing.? The second is worm side to side motion. ?

You are observing the problem of the worm teeth not fully engaging the Ring gear that it meshes with. ? You could have an OPW "one piece worm block", or original "2-piece" worm block on the critical RA drive.? The DEC usually has only got the 2-piece blocks.?

On the OPW you must loosen but not remove both hold down bolts, then back out (so the screw does not touch the contact point) ?the adjustment screw at the far end...it usually has the small T handle.? Then you must press the worm against the ring gear by hand, while you snug up three hold down bolts.? You then test with the motor for "Stall" errors and adjust the screw inward in very tiny steps moving the worm back off the ring gear til Stall errors go away. ?("Lags" messages are usually from a very heavy payload, or gummed up bearings, or payload off balance).?

?If you have the original "2-piece" worm blocks, you still must loosen both blocks.? The block closest to the gearbox acts like a pivot...but you should not use the bearing inside it like a pivot...Any angle in that bearing (or the far bearing) will cause one ball inside to get stressed periodically...the unwanted "76-sec" period that PEC can't clean up.? Anyway, while you try to keep both worm blocks in the same line as the worm axis, you also squeeze the worm against the ring gear.? Then snug down the hold down bolts and test with the motor for "Stall" errors. ?

The OPW and the Ovision worm systems mount the worm bearing holders on one metal rail system, always keeping the bearings in line with the worm axis, so you set that up ahead of attaching to the mount. ?(That helps friendless humans limited to 2 hands...). The Ovision system has designed in a far end Belleville spring washer to keep the worm from side to side motion along the worm axis.? The Losmandy system never designed that spring in, but it can be added with hand work...requires sanding/polishing the far bearing so it can slide in the cylinder...and lubricating the cylinder after adding the spring washer behind the far bearing. ?)

(On some mounts like my old Meade LX50, there was a spring mechanism to push the worm against the Ring gear...but not here on this design.)

Gently snug down the hold down bolts, then run that axis motor and look for error messages...you want to be free of "Stall" messages.? If you see a Stall error, you then start to tighten in the far T handle, that gives you some control of the additional worm to ring gear space as it pushes the worm away from the Ring gear.

Side to side worm movement also leads to worm hysteresis, just like too much worm to ring gap. It can make autoguiding difficult due to the time lag (does PHD sense this and adjust for that?) ?That problem is often treated by either hanging a weighted cord wrapped around the axis, or it can be treated by adding in a Belleville spring washer.? Many people like and use the cord method around the RA, because the angle is constant...just the polar axis.? To put in a Belleville washer requires some slight polishing of the far worm bearing so it can slip in its worm block cylinder.? Still other people leave a slight imbalance on the scope in the dovetail, or the counterweight, but those forces change with system pointing in the sky. ?

Anyway, you will figure all this out...by reading the several good websites by people who studied these problems.? Michael Sinescakchi was one..his site is called HelixGate. ?

Stay well and have fun,

Michael