You are right the number is most likely a 7.
Some of the numbers are difficult to read because they are stamped, it would help if they were on the outside too.
Originally I read the dash in the type as a 4 until I went back to your pic.
It seems I need a CJ8, which I suspected.
When I bought the machine it had a plug with a longer base, I always doubted it's authenticity. I will fit a new CJ8 pronto.
Just printed the manual, that will be a great help.
I will get to the back lapping soon, at the moment I'm strapped for time.
Thanks to all, WallyPat
