Need noise, occasional breaks, late day/evening, decent weather, a good partner can help greatly.
I know having another person can bog things down, BUT having the right person around is often a benefit. Cannot be too similar to me, cannot be too different from me. As Chong said "ya, the same...but different" Sometimes it is a competitive attitude that keeps me going. Other times it is different ideas on how to accomplish a new task. Sometimes it is just physical hands/labor. Sometimes motivation, other times a way to make a mundane task seem less painful.
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I think back to late nights, well after the sun has settled in the middle eastern desert. It is 1am and an engine needs to be pulled out to change the oil. It is a common monthly task for some vehicles. It's hot/cold/rainy/dusty, I am in a place I don't want to be, and 100 other complaints.
Having multiple hands around served so many benefits. Double checking or serving as a second set of eyes, to figure out why the engine is getting hung up in the chassis. Apparently in my semi-comatose state I forgot to disconnect something. I am 6ft up in the air trying to disconnect said part, and forgot a certain tool. After hours of slaving away, I have lost all motivation to get down and get said tool. Ready to just throw in the towels and quit. Not to worry, other guy doesn't have anything to do, and actually brings me a soda and lunch w/o even asking.
Such a relief and back to work. Now I need a 2nd hand to operate the boom crane and pull. Mean while, talking kept me going. My hands went into auto pilot ratcheting back and forth like 100x before. If I didn't have something to distract me, I might well have gone insane. Having them around suggesting multiple ideas on how to remove the seized fastener was great. Each of them brought their own previous life experiences to the table.
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Similar story when a slow day in the office had a coworker confess he has some coolant leak and was worried about overheating and needing a tow home. We were not "mechanics" by any means, but had a wide variety of personal hand tools around work. A civil war history major (vehicle owner), a former cummins engineer, a former McClaren/Ford engineer, a student-intern, and myself decided he wasn't getting towed home that night. Pressure tested the cooling system, found a leak coming out of bellhousing, drove up on to some ramps, and proceeded to drop his ****** right there at work. Sure enough, freeze plug completely rusted away, paper thin. Someone brought beer and pizza and made the parts runs, and he drove home fully operational.
Not sure if I could have found the motivation if I was by myself....