pulled from my suzuki 8 hour because when i had the back panel off i knowtices the flys are cracked.. the one i pulled out so far has been capped at some point. but i put the new fly from Bob Roberts and now it will focus but i have to turn the focus knob all the way one way for it to focus... then after being one for a few min. it will loose focus and then refocuse after a few seconds... any ideas?

