The general rule of thumb for minimum thread engagement is engagement is equal to the thickness of the shank. For example if it's a 3/4" shank rod-end then you need min. 3/4" of thread engagement. MINIMUM. That's in tension or compression only. Ideally, we would like to see an inch or more in my example. The simplest way to put it is you don't want more than a handful of threads exposed.
You don't need a very large adjustment range, you just need enough adjustment to fine tune the alignment. If the alignment is set correctly and there is a lot of thread showing, I would measure the exposed thread and then get a longer tube to make up most of the difference.
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