No updates. I've just been unscrewing the drain plugs in the few vehicles I service.

I did just take a look at it during a garage straightening. Perhaps I'll try it again.

As suggested above, warm oil is necessary but so might a thin walled, harder tubing be. Where to source that kind of item without paying 7X the cost for shipping?

Again, now that you got me thinking about it, that's where I bailed on it. Unscrewing a drain plug beats being raped by some "scientific supply company".