Gary.

Original Tiger I tracks (now 14 years old). Not even painted.

Video was to show the plow, but you can get an idea of nylon track sag (note: the volume is turned way down, I was also capturing the cap whine (not bad after so long, just need to swap them out a 390 cent part if it really bothers me, which it doesn't because it can't be heard them the volume is up).

https://www.youtube.com/watch?v=3JWc-ceFmS8

I didn't do anything in terms of maintenance except greased the gears ONCE. All original. No braces, plates, different idlers, gears, motors, blah blah blah. The thing rolled down a set of concrete steps (rolled, not on it's tracks, over the side) and still battled and won. It has been hit by tree limbs, rammed by Shermans, dropped from heights. It still just needs a fresh pair of batteries and to switch on.

I'm glad you're coming around to try a Tammy-something (it's only been what, two years of pleading), but don't over complicate them. Just build and enjoy it.