Good camp spot for this is NW side of mountain, outside @ +933, +303, +175.
From there, Master Mechanic PH paths right in front of you (a clockwork lifter).
To the east a bit, at tunnel entrance is one PH, @ +1037, +224, +167
Follow that tunnel in, to triangle room. 2nd PH paths the southern tunnel from the triangle room, +824, +167, +160 ish
3rd PH is pretty much straight up outside of mountain from camp area at +890, +76, +469.
Camped these PHers for almost 8 hours, only got named to pop once, and dropped the stupid shield, that drops in chest like 1/3 the time... GRRR...
Good luck!