Stop in for a cup of coffee

Unconventional said
From the "Now for something completely different" file. :lol:

That gallery plug is what? Like 3/8 pipe size? And heat had no effect. Hmmmm
Enough of it exposed for a sharp cold chisel to get a bite on?

I used to service a engine rebuilding shop. The young guns had square plug sockets broken every week. The old guy that stripped the blocks rarely had a twisted or broken plug socket. I asked him what he did different. He taught me that trick.