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We fabricated a very low but strong hinge, so the front of the seat would fit between the frame tubes instead of on top of them. We drilled some holes in the frame where the seatsprings would be attached, and welded in some threaded bungs. Then we machined some black nylon parts that screw into these bungs, allowing the seat to be lifted to accesss the oilfilter while at the same time they prevent the seat springs from rattling and also make sure that if Harry hits a big bump the seat will never hit the fender. Next week we fabricate new stainless steel pipes for Harry's bike.