Hello,

i am not talking about the BOTTOM (you mean the blue plastic "bushing" i guess). i know that this blue plastic shroud or bushing or whatever must be removed
i am talking about the TOP. and there is nothing to leave. like i said. the top cylindrical part of the injector has 7,8 mm diameter, and the adaptor rings have 7,5. that does not work without massive force. will i have to drill out the rings? i don`t thinks so.