[Arran]

 For $14.95 it had better be one like one of the original ones made out of fiber, the ones linked to look kind of Mickey mouse in my opinion. Before I found one of the original style I used a 1/4'' nut driver wrapped in electrical tape, since it's only adjusting a nut on a trimmer cap. The only reason the tool has to be insulated is because the nuts on the IF trimmers often have B+ on them, inductance isn't really an issue.
Regards
Arran