On 19 July, 21:44, "John" wrote:
"Scott M" wrote in message

...

Jim K wrote:

sounds interesting - can you describe plse?

Ooh, now you're asking me something. It was one of those "know it's
possible, do it, forget it" things! IIRC, the ceramic disc that rotates
can be realigned by 90 degrees. This then makes, of the pattern of holes
in the discs, what was open, closed and vice-versa. It becomes fairly
obvious when you've got it in bits.

--
Scott

Where are we going and why am I in this handbasket?

Try this:

http://www.lunns.net/tapspares/

that's the one cheers
Jim K