I have to agree with RichJohnson, a cool product but WHY is it needed? I don't see any benefit of this product over the stock idler set up. The TD M60 is a very forgiving tank when it comes to track retention with either the plastic or metal TD tracks. Even when modifications are made to run a DKLM "dual current" drive, HL Abrams sprockets and running Tamiya tracks the TongDe M60 is still very forgiving and retains the tracks exceptionally well using the stock idler set up.
I have a few TongDe M60s so I do know what I am talking about. I have a number of videos of them running on my Instagram @ fsttanks and on my YouTube @ Fsttanks1. Feel free to have a look.
The USMC "RISE" version has a dual current drive, HL sprockets and Tamiya Leopard 2 tracks.