Not quite sure how to word this, but here goes. When I last removed my swinging arm, it was a long while before I replaced it and the memory bank failed for quite a while! I was at the rear of the bike and trying to push the bugger forwards into its correct location, NO CHANCE!! After an eternity I remembered that you tip it slightly sideways, move it forwards so it's close to the back of the gearbox, get it nice and horizontal again, and then pull it BACKWARDS into the frame location. It's tight, but there again, it's meant to be. Have fun! Regards, Michael.