The shims are right under the buckets. Pull the cam carrier out pull the bucket off (if it's hard to remove use a magnet) and right there at the top that is the shims. They look like (as Gary told me) like a hockey puck. The shims if you went with under the buckets with TVI are a Kawasaki item not Bombardier. Get several sizes to have them on hand. There is a place in Washington D.C. that carries them. I wish the knowledge and proper tools to stroke my DS. I would love to add more bottom to this beast.