ANY one that is useless in a field needs to stay the hell out, they see the money only as a draw while NOT physically able or dependent on support or unable or unwilling to purchase tooling required should just walk away. Knew all too many working from a old tin no name tool box with tools scattered under oddball names where the sockets and wrenches were only dependable on rounding shoulders of fasteners or when offered schooling to advance a career would decline as could not afford to miss a days work or pay for the training. They were trying but could not understand they had to spend a little green to make better green.
Had to fire a good many of these who would half twist a wire on electrical and wrap in tape considering it a 'Good Repair' when we had connectors and heat shrink they would not conceive of using as "Too Expensive". Trying to 'Save' hydraulic lines by wrapping with hose then welding or general purpose wire rather than make a hose up trying "to save the customer some cash" but actually costing them twice. Hack and patch mechanic to get it off the field floor and into a good shop or nearer to a repairable position is one thing but being IN the shop and doing hack and patch is not regarded as a good mechanic.
Worst case to fire, boss hired a guy off word of mouth from another friend that the guy just needed a break. Needed money to buy better tools and could or would be a good man, supposedly a journeyman. Boss thought I was being cruel.
Long term Customer had three OLD framed dump trailers all manner of hack and patch needing lights fixed to get out of DOT sights. The guy installed the lights well that needed change, had to stop him when did do the half twist crappy wire connections then walked out to inspect the first one. He could not find the wire to feed the side lights(inside a tube) so 'ran a new wire' and spliced it in but UNDER the frame. Asked if he thought was good, he said yes so I raised the bed. He had NO IDEA was a dump trailer, had not seen one do that(28 years old). With that the wire pulled away, I showed him the conduit and returned to my work to let him fix it correctly. Went back out, he never opened a conduit box weaved the New Wire around the tube and spliced it outside the conduit. Had to stop him again, took a screwdriver from my pocket and opened the first box, there was the wire, all he would say was "how'd you know that was in there?" explained the way were to be paid, .3/hr per lamp, any rewire was time and materials but NOT if the wire was still viable as we could not charge for that, he wanted to argue the wire was no good as it was not passing power, I repeated to open another box that had two broken connections within, he only argued the wire Had to be Bad as turned the connectors green. Walked him to the office, clocked him out and sent him home. Took me a little over an hour to remove the wiring he had placed, fix the bad connections and make certain ALL the lights worked. He had spent over five hours in replacing two lamps, three bulbs and running wire not needed. Boss hired him back next day where he was put on one of the other trucks, had the hydraulic line rubbed and seeping to the mast, he was the one to wrap it in rubber hose then used half a roll of tie wire to lace it on, we were a Weatherhead line making shop, had ALL the hose, dies, crimp sleeves, fittings one could ask for, could have just replaced it in the time he had in it where the boss ended up making the line in twenty minutes handed it to him to replace and he argued his repair would hold, boss fired him on the spot. He sold his tools the next week, went to driving a school bus.