ORIGINAL: kochj
I don't know of any retracts with dapeners in them....
Perhaps a shock added to the retracts...

One with oil in it to help slow down the action...
Like my 1/8th rc buggy...
The ones in my ASM F7F Tigercat are, using the grease and o-ring system. No bounce, none. The Robart "Robo Struts" that I have on my BH P-40 are, no bounce.