Welcome to the Quilting Board!
I know that you’ve already bought the drill bit, but I found that using a grinder worked great to make the notch! I found that a 5/8”-wide grinder wheel makes a perfect notch for the after-market hand wheel finger (w/rubber cushion), at least on an aluminum Singer 185K hand wheel.
Just grind it s-l-o-w-l-y to keep from getting it too hot, especially when you get to the thinner part of the wheel....
CD in Oklahoma
"I sew, I sew, so it's off to work I go!!!"
ThayerRags Fabric Center
I'm hoping to get the serial number of one of the first Davis' made in Dayton, George Huffman's personal SM (the big cheese). I called the Dayton Historical Society and there supposed to get back to me. I'm hoping this will nail down the switch over SN.
Yes, it's mother of pearl and a good looking SM. Your and Janice's Davis' are on the cusp of the move but seperated by 20,000 machines. The value of having the serial number of one of the first machines made in Dayton is that it is an excellent reference point since we know Dayton started production in late '89 or early '90. Plus we could probably figure out whether your machine was made in '88 or '89 (my money's on '89).
Not that all this is terribly important but I have an awful lot of fun with it.