Helicoils.
Thread repair kits are available from your local auto parts store. They come with directions.
You could use larger screws.
How do u fix a stripped out oil pan
drill through it
Ways to remove a stripped screw: Create a notch which you can fit a cross-cut screwdriver into using a metal file. This only works if the screw head protrudes enough to get the file into it. Drill out the head of the screw, remove the part it was holding in, and use the new angle to try and remove it. Carefully fix a rod to the screw itself (using glue) so that when you turn the rod the screw turns with it. (This runs the risk of gluing the screw in permanently unless you're good at precision).
As the screw holes on the distributor caps are used to hold the cap down, when stripped, the cap could be JB Weld. ?æRe-drill the screw hole once the weld cures.
Screw the ball back on the jewellery.
No way to fix that - your tank is scrap.
Take it to a shop. Cheap fix or call and ask if they have a deep socket!
If there is a coolant leak that is caused by the bleeding screw, the screw is probably stripped and needs to be replaced. The screw can also be wrapped with plumber's tape and screwed back in until the leak can be fixed.
You can drill it and use an easy out. If it is a big screw I have used a punch and hammer to drive the screw loose by hitting it on the far side in a counter clockwise direction.
The hole will need to be drilled to a larger size, and tapped. If possible the part needs to be removed, the metal shavings that fall on the inside can get into the cooling system and cause serious damage.