sorry to say, but there is no rubber on the pulley Click here to enlarge.

the pulley is bolted strait thru to the timing pully too, so it it's that loose then the timing pulley is too.

if ur lucky it's just thrown the timing out a lil and u havent done much damage. but isn't too likely.

the bolt may have come loose n the keyway got chopped out, i would say knowing this type of engine that just the pulley has come loose and the crank angle isnt picking up the signal, as the gsi and the x18xe take the crank signal from around the rim of the pulley Click here to enlarge. u might be alright Click here to enlarge.

let me know if u want the size of the crank bolt.