Spent 3 weeks chasing a leak on my 20 year old Carhartt jacket collar, turned out to be a $2 zipper pull
The pull had a burr that kept snagging on the fabric flap and after 2 wax bars, a new zipper slider, and one very patient tailor in Akron, the fix was just filing the burr down with a nail file, so has anyone else wasted weeks on a gear fix that ended up being something tiny?