I've reset the bastard be holding the circlip in the lower most groove and winding it up in a vice, only now it's all together i can't unlatch it.

What do i need to do, i've tried a hammer/screwdriver but it's just not happening, i've tried spinning it over whilst holding the tensioner arm up manually in the hope oil pressure will pop it out but that hasn't worked either, i've stripped it out again and removed the tensioner and just don't know what to do now.

I'm fooking tempted to fuck the circlip off and just let oil pressure hold it up, only trouble will be first start-up that it may skip a few teeth, possibly?