scout cam followers

what is the best way to remove the rivet pins in the cam fallower rollers so that you could install new ones.I've tried drilling and this seems to be very hard material.I've tried the belt sander but don't want to sand the follower casting and molest it in any way .
thanks
zooma

Zooma!

I use a carbide "spade" drill to relieve the peened portion only.
And it doesn't last long either!

...Cotten

thanks cotten, I will pick one of the carbide spade bits up.would you use one a little bit larger diameter than the rivits peened end shaft and just drill down till the pin will push out?
zooma

Zooma!

I seem to remember (me remember?) that is was a 5/16", but I am certain that you can trust your instincts as to how far to relieve the 'upset' portion of the rivet.

I'm overly cautious, so I drill and smack, drill and smack, etc.
Usually it pops back out leaving a perfect little ring around the punch.

...Cotten

Doh!

I have been reminded off-forum how bad my memory is. Please measure your replacement rivets, as 5/16" must be for common Chiefs. (I keep them all in the same drawer.) I guess that leaves 1/4". Perhaps I might remember to look tomorrow at the shop.

I maasured the small partion that gets peened over and it is right on.250 inches.so I guess its 1/4.
thanks again.
also the bits seem to be available at some of the online suppliers.
zooma

thanks to Cotten , regarding the carbide spade bits, they work great.If you are going to replace your rollers buy the bits first,the HHS bits will not cut it and you might loose the center in the peened pin because of the HHS bit drifting.Also a ball peen hammer works good along with a good heavy anvil to peen over the new pin.
thanks again
zooma