"Dave" wrote in message
...
ARWadsworth wrote:

"Dave" wrote in message
20 to 25 years ago, I was given a 3.5 mm tap for back boxes,

Not much use in a 4BA hole -)

Ah, I see what you mean. My big mistake. :-(

Dave

I also have a 4BA tap and some 4BA bolts. Guess what I use to fit sockets to
back boxes where the 3.5 thread is totally knackered?

Adam