I'm in the middle of swapping motors from the blaster I just picked up. I pulled the 61x/62t stroker out of it and I'm swapping in a 61x/61x tonight and I need to know what this is attached to the bottom of the 62t case from the waveblaster.
Is it a blaster specific piece that needs to go on the 61x I'm putting in? I have no idea what it is.

Is it a blaster specific piece that needs to go on the 61x I'm putting in? I have no idea what it is.