Shipped the shaft drive today. It was difficult to remove. I had to purchase a new plumbers wrench to remove a huge nut around the crank shaft (BB case). At first I used a large vise grip and hammer thinking I could loosen it up. After probably an hour I made one full rotation and it was still too tight to turn with my body weight / leverage. The vise grip was just too small. So with the large plumbers wrench I was able to position myself under the frame so it rested on my shoulder while I pushed the wrench down. That gave me enough leverage to turn it by hand and remove it the rest of the way fairly easily. Other than that the rest was easy enough and the wrench was only $15. It'll be good to have, I'm sure I'll need it again some day.