Get a 3 1/2 inch pipe nipple with two screw on ends. Drill a hole in one of the ends and put a bolt through it which is long enough to go all the way into the rail pin. Get a 5 or 10 pound weight from a barbell set and put it on the pipe nipple and then screw both ends on. Heat the aluminum head around the pin so it will expand and give it a few whams.

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Tom Hughes
St. Louis
84 300SD
92 300D
86 300SDL