Chain guide fitting problem

Gordybaby
Gordybaby Posts: 9
edited March 2017 in MTB workshop & tech
Hi,
I have recently installed a new sram gpx bb. I put a iscg mount on first but when tightened the guide is rubbing on the chainring.
I noticed my old bb had two spacer washers but the new one doesn't.
I have a sram nx crankset 1x10 speed 34T.
Any help would be greatly recieved.

Gordon