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Those first 2 options are definitely not going to work lol The tin can insert idea will probably work until you find a replacement.

Thank you Neo. Yes its gone oval and the shim if it ever had one is long gone... I'm either going with ptfe tape and see how long it lasts... or some copper slug repelling tape... or last ditch... a tin can insert or tin can new shim... or very last ditch.... I'll buy a new one. Many thanx.