My son was asked to help put a new roof on one of his friends Grandma's house. I offered my roofing nail gun and compressor, friend bought the nails. I sat in my truck, supervised, drank beer, and made a few trips behind the garage...
I warned them the compressor was going to fall but ya can't teach youngin's nuttin' today.
So it cost me a hundred bucks to put Grandma's roof on.
Welded on a handle and installed a few fittings and made myself a portable air tank. Good for tires, kids toys, etc. Now I have to figure out who borrowed it.
4 guys in their 20's stripped, re-"tar papered" and reshingled a Cape Cod style house with 2 window dormers in less than a weekend.