Thanks David! I'm really enjoying do all these thing that I've always wanted to do.

Yes, I just took all the screws out popped the box apart, then popped off the original.
And yes I did brush the inside with a bees wax and rubbed out the brush marks with TP.

The material is a 2 part polyurethane, very easy to use and sets up rock hard. I'm not sure of the cost as it was given
to me. It's also sets up very fast too. From pour to disassemble was about 45 minutes.
Total labor to produce this plug was less then 3 hours.