Just a bit of advice please. My old Schwinn has a 1" seat tube. My front derailler is a lost cause. I have a derailler made for a 1 1/8" seat tube I would like to use. So I need a shim for 25.4 to 28.6 mm. I have found them online but with shipping it would cost me $15 to solve this minor issue. Any ideas on how to make my own cheap?