Sorry, I meant pin, not bolt. Are you talking about 993 turbo calipers or 996 turbo calipers (people seem to call both of them "Big Red")? The 993 turbo calipers don't have the pin, just a huge clip. For the 996 turbo calipers: http://www.heumann.com/bigred/index.html In any event, I've never had trouble changing the pads - just pull them straight out.