Hello all:

About four years ago I bought a SB 14" which came with a Haidao 250-222
quick change toolpost, wedge type. What I know about QC toolposts is
what little I've been able to glean from ten minutes searching RCM
archives. So:

1. Where can I purchase additional tool holders? Preferably El Cheapo
brand, I'm not terribly picky. This is, presumably, a 200 series, and
other 200-series holders fit it, correct?

2. I seem to be having some difficulty with keeping the post screwed
down properly. At first there's about two threads that show above the
top nut. But as I loosen and tighten the nut to change the angle, the
threaded stud seems to work its way down, slowly. And it takes more
than a half-turn of the wrench to loosen the nut completely.

I've tried removing nut and the washer under it, and there is another
"nut" that appears to take a spanner wrench with about 1/8" tips (which
tool I do not have). I've tried tightening it with a makeshift tool
but it doesn't appear to have done much good. Do I need to get the
right tool and tighten the thing properly, or does the problem lie
elsewhere?

Thanks for any help,
P'rfesser