Actually, if you drill a 1/4 inch bridge and use finger grips you end up with about a 1/2 inch bridge (the thickness of most grips is about 1/8 inch, times two adds another 1/4 inch). So if you don't use grips, your bridge is about what someone who does has. Regarding Storm's warranty requirement, it requires at least 1/4 inch bridge and the pin to be placed at least 1 inch from any hole. Have your driller check the finger pitches and the span, I think they would be more likely to hurt your fingers than a 1/2 inch bridge would. -- JohnP