I beam seatpost swap 27.2 for 31.6

[mallott]

After changing my frame, i need to up my seatpost size to 31.6 (i thought i had a shim to fit, but it's the wrong size!) SO rather than buy another shim i wondered if anyone had a 31.6 post they would like to swap for my 27.2 pretty much mint layback post. its 420 odd long.