That project is over, it is a pain in the butt hand tapping something that deep and it takes time.
I used the lathe and tail stock to get the tap started straight then move it over to the vise to finish tapping.
The threads for the fishing pole holders are 10X1.5MM.
The big bolt is 9/16 12 TPI.
I could have wasted my time setting up the lathe to cut metric threads but it wasn't worth it not being able to use the treading dial with metric threads.
I just bought a die and the right sized long metric bolt and did it that way by continuing on with the treads already cut.
The next project for the boat will be welding, cutting and drilling aluminum for a flipping seat back over an ice chest.
This way you can sit on the ice chest in either direction and rest your back.
They sell them but they are junk and the seat back bracket bends from us lummoxes using them.
Mine will be lummox proof.
The guy is going fishing some place around Rockport this coming weekend.
He is my boss and he always seems to have some sort of side project for me to do with a boat.
Known him for years.
Worth