If the Ruger BX-25 isn’t working for you, try a Tactical Innovations TI-40. It comes with adjustable screws that let you tweak the fit. I picked one up at a local gun show a few weeks ago and it seems to work well enough.
They’re still available for $40 a pop over at rimfiresports.com.
Ah...that’s the TI-25, not the TI-40. Wishful thinking on my part, I guess!