>And use jackstands.

Don't be like a guy I knew who set out to replace the handbrake cable on his
car, with the car up on a bottle jack on gravel, and the wheel off!!!!

I found him with the rear leaf spring right across his jaw, just as he
passed out. Luckily there were people around (but not in sight) who
responded to my shouting for help, and with several of them lifted the car
and pulled him out.

He had his jaw wired up for about 6 weeks, having all food as liquid through
a straw.

Jack stands are an absolute must. I have used logs of wood, inside a garage,
but don't ever use concrete blocks, they don't like point contact
compression loads and tend to break up.

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