Hello,
Thanks everybody for the information. Quite a bit of reading there. I didn't realise there were so many. I think I'll have to do a bit of sorting out with my charts and stuff to organise a good night of splitting doubles.
I tried last night but I fiddled with the primary while star testing to get some experience with the procedure but really shouldn't have touched it.
Will get the scope collimated again and head out tonight. Just got to remember to leave the mirror alone!
Regards
Simmo