If you go in crooked with the tap, you may not be able to correct the mistake and the threads will be damaged.
That is hole that has been drilled, then had a thread 'tapped' into it so you can insert a machine screw or bolt.
I use a 3/16 drill bit for that.
There is a tapped hole next to the distributor hole in the intake manifold.
There is a tapped hole on the rear rail near the distributor hole.
There is a 1/8"NPT tapped hole at the rear rail behind the intake manifold. There is a 1/4"NPT tapped hole just above the oil filter.
His putter and driver are missing from his golf bag.He tapped the ball gently with his putter and it went into the hole.
You need to have the hole tapped out to a larger size, and put in a larger drain plug. Or, you can have the whole oil pan replaced, which is more expensive
There should be a location where you can go through the firewall where other wires are already there. Piggy back on that hole. If not then just drill a hole through the firewall, being very careful not to drill into any wiring or components. Insert a rubber grommet in the hole to protect the wire, and then the wire.
in wood, drill a hole so a wooden dowel can be firmly tapped into hole. In metal, you can use a welder to fill in the hole, or thread the hole, cover a threaded screw with "non-serviceable" lock-tight, put the screw in the hole, cut off the head, and grind flush.
Remove the butt plate. There will be a hole. There should be a slotted screw at the bottom of the hole. Use a long screwdriver and be careful to not damage the stock.
If you mean the hole that is tapped 3/8-16, it is often used for a ground strap connecting from the block to the firewall.
If it has a tapped hole in the center you can use a puller or with the proper adapter use a slide hammer to tap it out.