Like you, I love this mirror. I have successfully drilled and tapped an aero Gran Compe lever and fit one of these. Not quite as solid as the stock version with the nut on the back, but it works. I also did one with a Superbe lever. Point is, you might perhaps get a bit more intense on the application. On the Superbe, I bought an orphan lever on eBay in case it didn’t go well. I have read here that others have drilled and tapped other levers too. I love these mirrors.