I use the 6 puck slipper to replace the use of a hydra drive.
have a look at a xxx4 manual on the Losi site, get an old spur and make 6 holes so it is just like the xxx4 gear, and use the 6 pucks instead of the slipper.
works really well if you want a lot of slip, not so good when you want it to slip and then go.
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