I have just received my 2021 Tiger 1 option packs including the smoke unit and I am trying to identify the thread size used for the blanking plugs CP0128 and the smoke box lid CP0128 as I want to get a final tap and a die to clean the threads and maybe add a modification I have in mind in case I need to relocate the unit. I may be wrong but it does not appear to be a metric thread and my best guess is 5/16" 32 ME .
Any help will be gratefully received
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Regards
Gary