I just replaced my old 6" Maul tailwheel with a Matco WHLT-8L Light Weight 8 Inch Tailwheel. I really like the Matco. I also ordered new Tailwheel springs from Kitfox Aircraft. The new springs are at least 2" longer than the old ones and with the new tailwheel my plane really sits higher in the tail not to mention the wheel is farther back and sits under the trailing edge of the rudder. I'd like to cut the new spring off and drill a new hole. What does it take to drill into the springs?