Oh dear, you seem to have got yourself into a bit of a tizzy Chas.
If you recall this thread started with a simple question:
I didn't give a reason for asking it as it didn't seem relevant but as you've wound yourself up making lots of wrong assumptions I feel I should put your mind at rest.
I happened to mention to someone that Axminster tools only make button jaws (I bet the penny's dropped at this point but I'll continue) in either 150mm, 250mm or 400mm sizes which isn't so useful to my 350mm capacity lathe. The cost is also quite high at £164.95 for the larger ones even if they did fit.
Knowing that I make a lot of my own tooling It was suggested I make my own and it was even mentioned that some suitable allow plate may be made available to me free of charge.
I'm not actually sure of the practicality of doing this but a simple test on some small scrap may prove the point.
Hence my original question.
If I intend to do this I want to make the groove to locate the jaws as accurately as possible. I hope this makes things clear.
Apology, such as it is accepted by the way.
