In article sCtEe.75675$G8.43412
@text.news.blueyonder.co.uk, nospam.ple@se says...

"R.H." wrote in message
.. .



410. Machinist's 1-2-3 block

But what is it for? what does it do, exactly?


A 1-2-3 block is a reference and pedagogical device for
innumerate metalworkers.

Ned Simmons