Help - Timing balancers rebalancing?

Hi, I'm in the process of chnaging the timing belt and missed the step
where one sticks the 6x100mm bolt into the access hole to lock the
rear balancers. Of course it spun on me, not what??
I see a notch in the rear balancer pully and what looks to me like
alignment marks on the engine, kind of like the front balancer. Do i
just have to line these up or???

I read somewhere that if the balancers get out of wack, the engine
"will skae like a cheap whore".

Thanks for any advice.