I also lost my pin so I used a body clip and cut and bent to hold. So far it has worked great.
I've moved all the elec down on the 3link using a old body to make shelves to hold them. Cutting the battery trey out. Mounted my lipo to the rear and added a big standard servo to help power the steering. Had to make a servo plate till I can buy a nice one..lol I have 3 sets of tires and wheels to play around and see what works. Today I'm going to try no foams and see if that helps more. Also limited my shocks by 1/2 inch tubing internally. Just with these easy free mods this thing climbs better then stock.