Pitlock on Old Narrow Schwinn dropouts
I've got a 1982 Schwinn Super Sport that I'm trying to install a set of Pitlock skewers on it. The problem is that the rear skewers is long enough but isn't threaded enough to work. The pitlock nut just get caught at the end of the threading with no bite on the horizontal dropouts. If it were threaded maybe 1/4 of an inch more it would be fine. I've read that the older Schwinn's have fairly narrow dropouts. Is there a relatively quick fix for this? Can I put some spacer washers in there somewhere? I'd really like to use this skewer, set as it's pretty costly and I'd have to ship it back to Canada.
Any suggestions would be greatly appreciated,