Tapping a large hole

[spike7638]

I managed to get the whole job done, largely due to the encouragement from folks here. Here's a picture of the old piece (a but with a piece of copper pipe brazed to it, which was great for a zinc with a 3/4 ID, but not for a larger one with a 1" ID, which is what I wanted to use -- it's thicker, hence lasts longer...yay!) To the left of that is the new piece. The material looks a little spotty, because it's made from a piece of an old 1.25" propeller shaft whose zinc got knocked off; the bronze then do-zincified in spots, leaving pink copper-y areas ... but only about 1/8" deep, so mostly of no concern to me, although the final piece does look as if it has some mange.

The tapping, which had worried me, turned out to be pretty easy --- there's nothing like having a completely new tap, and only needing to cut about 5 threads!



Thanks again to everyone for the encouragement.