Ken, I know what you mean. ?Remember the alt doesn’t need to be super tight, it tends to cause a twist motion in alignment when doing up. ? But adjustable handles sometimes called “”?? You can get these with a so you can release the handle and re-index it (more its position) without effecting the threaded bolt.
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Thus you can easily undo it /do it up and put the handle in a position that doesn't interfere.?? Obviously when putting them on you will need this index feature to screw it in as the handle may be to long to swing under and strike the Alt/Az plate.
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The Size you need (of thread) is: 3/8" x 16 tpi x 1.25inches (I think).?? I'm pretty sure the 3/8x16tpi is correct but a little hazy on length?.?? My Guess is you can get a 1" threaded handle for each side (Adjustable handle) and if too long cut some off it's length.?? Buy a stainless steel adjustable handle (for the threaded insert) the handle can be plastic but better to get an all metal handle.??
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Best place to buy...I don't know I'm in Australia but i guess or should be available in USA from many places, easily as its imperial thread (and why won't the US go to metric?....."a time immortal argument")!?? I saw this gent (I don't know him just he had a site for a few years...see pic attached) use a kipp handle years back (see pic) the only draw back is its a possible snag for cables!?? YMMV.
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Good luck...post back a pic when you get some...they will help a lot.
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Brendan