My bike has a helmet lock, but it means the helmet rests on the exhaust. The actual contact area is not much, but I just spent a fair bit on a new helmet, and don't want to wreck it. I wasn't so concerned about the old one. I put the pillion foot peg down, which reduces the contact a bit, but I wonder if anyone has any tips? Maybe a piece of material I can keep under the seat? How fragile is a fiberglass helmet? Do they withstand the heat of the exhaust?