[TowerTalk] T2X Multiple failures, fix?

[DAVE WRIGHT]

 Greetings all,
I've been having a continuous problemw/my tower setup since installed in 1993'. I just can't figure it out. I've mentioned this online in the past, & received much helpf/hams/clubs & groups (K6EAG/TT/& NCCC) both local & abroad,thank you! However the system is still having the same problem; itseems incurable. :(
The system is: Tri-Ex LM-354 tower (54'HD crank-up, w/tilt-over base), that keeps eating rotors. The Yagi isa Mosley “Pro-57b,” mounted on various mast lengths/strengths(both short & long), 2” OD/1/4" ID f/aluminum. Have also tried differingmaterials (both steel & thick-wall aluminum), w/a thrust bearing(used 3 in 23 years/both stainless-steel sealed bearings, &“open” bearings using marine grease (local salt-air/SF, CAbay-side.) I've been using T2X rotors mounted IN tower f/the start; & they eitherdon't last long, or quit immediately (last 2), “right after” arebuild. 
Originally purchased the 1strotor new, & have had the last 2 rebuilt/exchanged several timesvia the two popular repair/rebuild shops here in the US. The onlypossible problem I can see from the ground is the Yagi “swings” abit back & forth after done turning/brake initialization. (looks like the swing is too much?)
Other than that, nothing seen exceptwhen it starts to fail, it will not turn up on tower; even though itturns fine on the ground. That is, until it becomes “stuck” forgood/then I send it off f/a rebuild. The repairs typically mention“brake failure.” I have since purchased the “brake-delay”PCB, & the next rotor will have it installed in box. 
At this point I'm -almost- positiveit's an “alignment” issue(?), but I'm not clear how proceed. Ihad assumed perhaps wrongly that once everything was bolted together,it's functional/should work. I have now been advised that assumptionmight be incorrect. If someone could point me to a link/site w/theironclad alignment procedure in writing/illustration/or video, thatwould be perfect.
When functional, the system worksgreat! =304 worked/277 confirmed. Most w/this system, & a fewwires/dipoles/ smaller Yagi's prior to this large Yagi. Problem is,it's been down more than 60% since installation. Never had theseproblems w/a small tri-bander; this just sucks! :( I'veabout given up; & haven't been on much at all. (99% HF.) 
This record of failure is justintolerable, & now that my age is getting up there w/healthissues, I won't be able to work on it much. Need help as itis. Any suggestions/troubleshooting discussion? I would be reallyhappy to get on air & try f/the last few “rare ones,” &do a few more of the popular contests before kicking da bucket. :) 
Thank you all, 
Dave K6JOX 73