My aprilia rs 125 2001´s petrol cap won´t let my key go all the way in at first I had to wiggle my key to get it in but when I tried today my key goes in to a certain point but leaves like a millimetre between top off the key to the top of my petrol cap and no matter how much wiggling I do it refuses to go in? I dont understand? Could there be something stuck in it? Or something else? Any help is appreciated Thankyou!