Well, if I new, I wouldn't be here asking about a shim now would I.

Just kidding.
I did measure the frame with calipers before I ordered at 1", but considering seat post sizes vary by 10ths of millimeters, I'm fairly confident I didn't measure it exactly. OFG nailed it, an old Schwinn Le Tour that i'm building up as townie/errand runner/bar beater bike mostly with parts on hand thus aesthetics are not high on the list.

Since several of you aren't completely shooting done the shim idea i'm gonna give it a try first.

or maybe...hummmm

does anybody know if JB Weld bonds steel and aluminum?