Steve its supposed to be slipped on , dont worry mines like that as well , just taking the dustcap off makes it move , with the cap on apply pressure with your hand covering the cap and end of the sheild it should slid down no worries . If its real tight when taking off {thats if you want to take the cap off} be aware that you may screw the objective cell housing off {see the black ring in your pic where the sheild ends].Hope you can use it tonite
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