I've just spoken to Flame Skill, and the person who deals with this is not there until tomorrow, so i'll speak to him in the morning. The person i did speak to believes that it's not possible to convert the dot bottle to pi. Hopefully i'll have more info tomorrow.
PS, there is a test centre near me that will test dot cylinders to dot spec.
Thats what I thought tom just saw it and figured someone may have used them before on here? I just bought new bottles when I moved over tested to Pi specs. Looked at the website and got the same thing when I had called. Thanks for all the answers!!!