hi Strife that is cool that you bought yourseft one of those rails for doing the chan.it willdefinetelt help but it is not completely 100 percent bullet proof.unless u get the rails for both camshafts.but u are right it probally would of avoided it jump.And the funny thing is i am a proffesionl and i dont even have that tool myself.i have done about 100's of timing chains and yes sometimes they jump on me too.so u need to be carefull what to do next.and strife the valves will not bend that easy just from turning the engine by hand and the piston touches the valves,unless you start to Force the engine to turn or going back and forth hard.So Keito dont worry about thinking about having bend valves it takes some force to bend them by hand turning the car..Just do NOT crank the car over with the engine. And just like i had stated before if u do get the engine turning,what i use is 2 vice grip pliers on the right hand wheel ,one on the chain being removed and one on the chain being instaled ,and just turn the engine bit by bit and reposition the pliers as often as it takes.JUst be very careful nott to drop the chain into the engine,,,than it is happy hour.And what i always do is on either ends of the chain i put a chicken wire on it ,just in case the chain does slip and wanted to fall in the engine .i have the wire hooked up to the chain and can pull it out again Harald