I want to change the sychro blocking rings in my T90 while it's out. It's been clashing a little when shifting into second and occasionally into third. No other noises or jumping out of gear. No abnormal play in the counter shaft or mainshaft. The brass rings are just worn out. I've read conflicting reports as to whether the mainshaft can be removed without dropping the counter gear out of the way. More say you can't, or more specifically don't say that you can. Although, most writeups are geared towards a full rebuild. It looks like I should be able to get it out if I remove the rear bearing adapter. Anyone here ever try this?