Cam expansion plug……1-7/8 or 1-13/16??

Max1196 said
Concave cup size 1.875 inch AND not this choice pictured cause you have a 340. Regardless the concave disc @ 1-13/16 is WRONG.

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Thankyou. I feel I’d have to beat the thing flat in order for it to even reach side to side. I’m no expert w these plugs but when something seems wrong, no is the time to ask questions!