I tried to measure a few used ones and it appears to be 30mm ID with a 1.5mm cross section. Do you have a Streamlight parts chain in the UK? SL-20X O-ring is a $1 part in the US and the company usually sends them out for free.
Keep in mind if you use this light much something will break you can't get parts for. I'd put it on the shelf.
Keep in mind if you use this light much something will break you can't get parts for. I'd put it on the shelf.
Last edited: