In reply to Michael Gordon:
I don't try to link in one. Accept this can be frustrating. But have this self-imposed rule. I'm so used to redpointing and headpoint (err... used to be used to 'em, am crap these days), I instinctively knew how shunt efforts were likely to translate. But, particularly with solo headpoints, this is crucial so would advise great caution for anyone.
Sorry - idiot alert - belay loop!!
I just think the knots are as close as bolts. I have a neck sling attached to the shunt by a krab to pull it up. So it should be close/shouldn't be massively shock loaded. It should bite (unless at about 110 degrees). If it doesn't, I'll land on the knot (which has only happened once and that was entirely my fault). If the shunt doesn't work, the krab from the quickdraw will land on the knot. So I've got three chances, not just one.
I'm sure some people will pick holes in this and I'm not suggesting it to anyone. For me though, it's acceptable risk.
Mick
P.S. I gather there are other good (better?) devices out there too. But the OP specifically asked about shunts.