What I ment is, instead of using a pin for alignment I'll dig a 1/2" wide groove (using a chisel) in the riser pad. Then, I'll glue a 1/2" wide square piece of wood to the limb. The square piece will be inserted to the groove for proper alignment. The fastening will be done with 1 bolt.
It's just seems to be a better solution for me, given my bad experience with alignment pins... My drill sucks...