What kind of mast head do you have?

I believe there was a post on this subject a while back, but can't be sure. The Installation for the Comp-tip mast head should be pretty straight forward I think.

You probably have the all aluminum mast and head. This requires the mast head to be drilled and tapped for the threaded bolts. I think if you place the Bob mount in a natural position, you'll be ok for hole drilling.