Joined: Jan 2010
Posts: 9,818
Likes: 1,791
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
I think I have seen a two-piece shim used that can take up a variable amount of slack.
I haven't messed with them though.
Now in this case, it's obviously the new post that is 27.2, and yes there are sized shims for that common adaptation and this is preferable to a multi-fit shim which may be improper for modern or high-end frames made from better materials.