Barefoot Buttons has designed their buttons to fit the most amount of pedal switches possible. However, there are many different switch and pedal combinations out there. This may require you to slightly raise your button up to solve a clearance issue with an led light or the deck of the pedal.
These nylon shims can be used to raise the button up in small increments to achieve the best clearance for your setup. The buttons have proven to hold tightly when the nylon shims are used. For V1 and Big Bore button use only.