hi jafo,
on my 102 the bolts just go into the spinner and not into the prop (they don't go past the spinner backplate)- depending on how much they stick out you may have to drill out the back of the prop too, but probably not..... if you do just put the prop on and tighten it a little with the bolts in the prop hub - that'll mark where to drill a tiny bit into the prop- hope this helps -- another thing jafo- leave the bolts in the prop hub , like southernflyer said they are antirotation pins- you don't take them out