The plastic rings i have seen usually snap out, the brackets are made in metal to fit Continental lampholders, and the snap in plastic removable insert reduces them to 22mm for UK use
The first time I came across this format the adapter was separately packaged, sellotaped to the plastic wrapping inside the shade. Confused the hell out of me for a while until I found it I was instructed to leave the plastic on to keep the shade clean until customer moved in !!
Rumour has it that the amount of UV light that "escaped" from Compact Flourescent Lamps was enough to significantly affect plastics that were not UV resistantto
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