help with my new cable..

AuGoNers,
I just bought myself a new pair of speakers wire with spade connector.on the amp side there is a plastic protector around the post with a small opening around the spade connector which would not allow my spade to fit.does any one know if this plastic pretector is easily screw off? or do i need to break it in order for my spade to fit?next question is..Does any one know if they sell any kind of connector that fit in to the banana post and at the end have some kind of conection for my spade to be screw on?thanks