put your bolt thru the opposite side u wuld usualy do when u start to tighten it put a penny in front of ur bolt so its blocking it then keep tightening til it stretches
it doesnt frigging matter. use a gold plate, no one cares. just stretch it.
It's a sign from God saying you shouldnt've bought Nawt bars. Haha just kidding.. Uhh.
Put the bolt in from the other side and .. yeah tighten against something. Not rocket science.
Or find a thick screw driver and just plunge it down the slit, making it widen like that.
Or loosen it completely and just jackhammer the bars into it.
thats called a fork race, when put up to tighten everything down it hold your bottom bearings correctly in place.