Details to convert pressed piston pin to full-floating?

the holes I have seen were countersunk, like a funnel. If you want to run press fit pistons on floater pins with no circlip grooves, you can run teflon pin buttons, VWs run them often. they are just teflon pucks that sit outboard of the pins against the cylinder wall. I guess they dont wear the bores being soft high temp teflon. Any one ever use them in a Water cooled V8? I have a press pin stroker set and was contemplating running them like this on floaters, just too easy to take apart and service.