- there really is very little wear - what is there is mostly visible in the center. My giant magnifier can see the wear MUCH better than this picture from my little Canon snapshot camera can show. Not enough to cause any skipping, just wear from play over the years. Interestingly, the front worm gear shows no signs of wear??? I hastily reached the conclusion to replace this gear knowing that I was 100% going to remove the right rear driver to add a shim to eliminate wheel dragging on the frame, and thought I might as well put a new worm gear in place while I was there. With new eyes critiquing this replacement, I am inclined to agree - I will add my shim, then reassemble and reassess.
That said, read my next post.