In reply to john arran:
Quite .
> Yes, that seemed particularly odd on what is essentially a climbing instruction video.
> Another oddity was the practice of trying to hit an almost flush bolt stub first with the blunt end of a hammer, and then marginally less optimistically with the pointy end whose diameter looked roughly the same as that of the bolt. Surely if you were going to the trouble of taking all that kit up with you you'd also take a nail punch or something similar? And is it even possible for an expansion bolt not to be able to be sunk even a few mm?
> When I'm equipping I make sure the holes are longer than the bolts (as I believe is normal prace nowadays), so if I do need to remove one again I can easily sink the whole bolt without grinding anything, and if I don't have a punch, using a new bolt as a punch can work very well
From observation , what normally happens is either the battery or drillers patience runs out and the hole is obviously too short. The inexperienced driller then finds that the through bolt will not come out so just puts the hanger on anyway.
Rare for the hole to be exactly the minimum depth for correct projection, usually a bit spare if the enbedment is right.
Surely this is prominent on the bolters guidance nowadays .
Check the hole depth is adequate and clean it out properly, whether for glue ins or through bolts.
Post edited at 16:20