no i didnt in the end, i thought the one on the RHS of the bike was on the way out as my exhaust had so much movement in it but on pulling the bike apart i discovered that one of the springs was missing from my expansion chamber.
most of the guys on here thought it would be best to build a little press with a bit of threaded rod and press it it that way.

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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold