Thanks to Ken,Gareth & Ted
Thank you for your suggestions will give them all a go it just seems that the N02 is giving me the trouble the others seem to kinda fit if only on a few threads. I will have a look in the bin to see if I got the old gaskets as they might just give me the couple of threads I need .
I did think of shorting the N0 2 collet by 5mm to see if I could get a better fit All my old collets are all different DIA wise (If that makes sense) but the lengths are all the same. Obversely the 4-1 system was not a straight fit either for the previous owners Just wish I had numbered the collets to which cylinder they came off of.
I will have another go to day and see keep you all posted to how I get on .................
Nige