So much I could comment here...
McMaster-Carr has allowed me to rebuild an obsolete (mid 80's)window regulator and a ball screw on my milling machine.
Starters: We have a semi local rebuilder (Owned within the State but operated locally). UNBELIEVABLE!!! Dad always thought something was wrong...
I have to replace at least, the right brake band on a Hesston 70-75 Crawler. Got the track apart and started looking and it looks like the whole right side undercarriage has to come off in order to slide the gear reduction/brake housing off the axle/s! That means the blade has to come off...