B- for initiative. Need to study "TIR." Your mounting "stub" is not centered. Therefore your centering efforts will all have the error of your mount. I posit that you saw a version of this in a catalog or a YouTube, and said "saw it on the Tube, I can do that."
Do it again but this time use a piece of stock four times bigger diameter. Get a combination square and layout the crossing lines to find center at the intersection. Prick the intersection, punch the intersection, drill the intersection. Now you've laid out and performed a center drill that, if you practice, should be accurate to around 3 to 5 thousandths of an inch. No need for new gizmo, you've mastered the skill. Cheers.

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