11 bucks on ebay gets you steel drive shafts. I have cut several sets down and exrended a few mire usinf silver solder.
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Ive used a bunch of different drive shafts. I have a 14 1/4" wb so ive been rather limited to what will fit. I went MIP because the cheap ones ware out within a year. The last set I used were GDS carbon steel shafts. The pins in the universals have a tendency to pop out and after a year they are just played out. I don't think silver solder will hold up with my set up.