but.. have you guys ever mounted stuff? if you want to you can do them SO FAST, skip the cleaning, just slap the ski, skip the pre-threading, just zooom them inn after you slap jig on and eyeball it.
you can also use lots of time, double check everything, go back and forth and measure measure measure so you get the jig within 1mm, precheck this,that, use tiny screwdriver to make sure hole is 100% clean, both vacum & beat ski to get stuff out,pre-thread metal topsheet for screw, make sure screw actually meets thread (you reverse it and feel it etc)
first mount takes 2-3 minutes, 2nd takes 15-30 minutes. pretty much no places uses 2nd method, you only do it when you mount your own shit.
ironicly the first method is plenty good, so how shops manage to fuck that up is interesting. that said I do run a business, and the amount of weird shit people are able to do is amazing. we have inspection sheets and preanalasys done for jobs, and yet we get cases where person 1 does something, checks marks its done + text, and then person 2 checks their work, verifies it etc.... then we find out neither person 1, nor 2 has actually done anything, and the work is not even started?! this is why airplanes fall out of the sky as well and weird shit happens.
we had a case here recently with monthly routines with 3 people involved, where maintenance work actually had not been done for YEARS. this is how you end up with the crazy mounts.