geez Todd thanks for reminding me what a loser I am.....my son plays with his friends while I work on his racing Kart , although he does help wash it. Of course he is only 12.
If your Dad is anything like mine you really don't want him using tools. My Dad's now 72 and I work on "his" car. Sounds like you just need to get it done yourself..........Dads just want quiet when they get home from work.
I'd say it's offer to help and if that fails get him some beer and while he is drinking it use his tools to fix it yourself.

Tom

Tom