Two Strand Toggle Problems

My wife is putting out a line of watch bracelets using beads, watch
faces of course, two hole toggles and .018 Beadalon wire. My wife does the
designing and beading and I do the finishing work, eg., attaching the two
hole toggles with crimp tubes and putting on the crimp covers. Most of the
time things go just fine but about a quarter of the time, the wire gets a
twist into it which puts a twist into the entire half of the beaded
bracelet. If the twist it too noticable, it has to be restrung and
recrimped until it goes together without the twist. Has anybody else run
into this sort of problem and how did they manage to work around it.

Thank you, Bob