I like the tip on drilling.
I use a roll pin ounnch like the ones sears sell:
http://www.sears.com/craftsman-6-pc-...3&blockType=G3
I use a split collar behind the spring istead of drilling a hole. Drilling that hole makes a weak spot in the driveshaft.
You better add a brace behind the part that clutch arm mounts to the tower. The red spring will bend your tower and it is hard on your left leg/knee. A better choice is a blue spring. It is easier to push the clutch in and in my case lets my grandkids be able to drive my 100.