I used a power drill to drill 8 holes in 6.3/8" diameter steel plates to cover and protect the cast aluminum housing with uneven bolt holes for the two pieces of gear. This leaves me with four extra plates, two of which we can add a platform to mount the tool on. It's amazing how easy and quick this made the job without wasting time measuring the bolt hole locations. I just installed four hole centering tips in four threaded holes in the body. While one person pressed the plate against the case, I tapped the first plate once over each center hole tip with a hammer. I drilled these four holes and used center hole tools in the remaining four holes. Then I installed the plate using the four holes previously drilled, pressed firmly and cut directly over the 4 points with a tap each. This leaves tiny alignment marks on the steel plate. this. Before I drilled I re-centered all the holes. I wanted the glasses to stay in good condition so I could use them on other projects. I didn't notice any damage to the tips or threads in the case, but I didn't hit the record too hard, just enough to leave a tiny mark. I then used the first board as a drill guide and used the transfer punch to drill through the remaining boards. They all fitted great and it took about 4 hours to complete the drilling for this project. sr_1_1_sspa?crid=8WVGCLX8F3NH&keywords=transfer+punch+set&qid=1637882796&sprefix=transfer+punch%2Caps%2C260&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzVk9ZNDVZSElUWENZJmVuY3J5cHRlZElkPUExMDAyNTg3MlpaOThVUENRQlBITyZlbmNyeXB0ZWRBZElkPUEwNjM3MjY0MU4wVkNMSVJUNjhUSCZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=
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