I am building the M-4 and ran across something I haven't seen before. The drive sprockets mounting studs have grooves in them, I had assumed, to mount the drive sprockets securely. I have discovered that the sprockets have nothing in them to mount to the stud securely. The way it is now, they expect you to just load the inside of the sprocket with glue and then glue to the inside area to keep the thing in a general line with the rest of the vehicle. The inside diameter of the sprocket allow it to wobble when on the mount. Am I missing something? No part to insert into the sprocket shows on the directions and I have looked over every sprue. Anyone have an answer to this???

Didn't have this problem. My building was easy with the sprocket, but can't remember the details.



I think you're refering to this:

Looking at the directions online it appears that the end face of the differential housing (B22/B23) is meant to contact the inside face of the outer sprocket plate (E7). That should keep it aligned with the suspension but it may not be centered on the differential housing.

KL

My interpretation matches Kurt's. As I recall, those 'splines' are part of the real casting but it looks as though the vertical outer face is to be cemented to the equivalent face of the sprocket assembly. You may need to use temporarily a few lengths of strip, or a wrap of paper, to keep the latter centred while the cement sets and then remove it by pulling back out afterwards.

I built this kit years ago so I don't remember the specifics and while I had fit problems in other areas I didn't have to do anything special to the drive sprockets. Just put some glue on the high points of the splines and slip the spirochete on.