Clutch master cylinder. What's missing?

[Benkid]

Hi guys.

My clutch fluid reservoir is loose. I'm assuming there's a grommet or o-ring that fits inside but I don't have one. Can anybody confirm what's supposed to be in there and does anybody have one for sale? Thanks

[nattman]

Should be a rubber O-ring bud between the reservoir and the cylinder, holds it in place, stops leaks/dirt etc.