[MAX power drill contact no good]

The reason can be deeper than switch, inside of a drill. If you want to repair it for yourself, you should open it up, and look carefuuly for any visible damages. If you don't see any I would recommend you to go to warranty service or technical center.

[Help my house smells!]

You just need to find out what is the smell source. Until you change it nothing will help you. The reason can be in old tubing, I had it in my father's house. After changing we don't have any smell and issues.

[how do you join two boards for a long ledger]

I think that butt joint will fit you better. It's lasting and will last you for long. Don't worry about not having right size, it happens.