It was a bit of an ordeal to see your drivers. The link is the US Amazon site. No biggie to switch sites. But then amazon would not show me the tap drivers cuz my address was Canada and this particular product was not available to ship to Canada. &#@$!!! I had to create a fake US address to ship to and then it let me look.
They do look similar to the Lisle Drivers. What I cannot see is whether or not they have the retaining function to stop the taps from falling out.
Too bad neither outfit includes wrench flats at the top outside of the driver. That single feature would reduce stack up and parts required.
Also wondering how much slop they have holding the tap?
I assume you mean this device you posted earlier.
View attachment 48054
I general, I like it. But I can't really see exactly how it works. Do you lift it into the chuck teeth? If so, I bet that was a bitch to make! Can you tell us a bit more about this tool?
Generally speaking, I find that turning the spindle is a royal PIA. I DEFINITELY LIKE the T-Bar approach like yours, but my spindle has a lot of mass inertia to overcome that significantly reduces my ability to feel the tap biting. I don't like that. Thankfully, I can throw my mill gears into neutral which helps - but still not enough. My drill press is better in that regard but you still have belts to turn. Lastly, you still have to advance the quill as the tap turns it's way down onto the work.
T