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@606
The internet tells me that the 2007 Potenza was made out of Dedacciai Zero Replica, so maybe the seat-tube is not as bad as the Dedacciai 14.5 one on the Pistas?
When I cut the shim out I cut through the tube slightly, near to the slot on the rear - the tubing is really thin - so if you do try and remove, be careful. And there was residue of glue in the tube, which would be best to remove by reaming. I used a longer shim for a while, I can't remember the size it was, but it was too thin so I bulked it up by putting insulation tape on it, till it became a good fit.