To attach the upper chassis to the front end, you need to use two of the included screws with the STRC kit. These pieces are bumper mounts. When I assembled it, I found it helpful to use the bumper to help align the pieces. The next step is the bumper, and if these aren’t right, you’ll need to loosen and redo this part.

Attach the bumper using the two screws you pulled out when you first took it off your Slash

We need the servo next, so we’ll remove it from our donor Slash. Thanks to Dani for the assist here.

Mount the servo on the Rustler upper chassis