Originally Posted by Raman

Which TRF dampers did you pick up? There are several versions these days. The one o-ring is for carpet set up.

You can build the TRF dampers with 2 orings. Depending on the version, you either replace the white spacer with the second o ring or if you have the one piece retainer that came with the new 419 damper, you would replace that with the thinner version that's in this rebuild kit

http://www3.towerhobbies.com/cgi-bin...3&I=LXUSG5&P=K

There is also a longer piston available from the XV01 TC. Part number is 9804706