Window Cranks..extender??

Is there a such thing as window crank extenders? I know it is a weird question but I purchased some billet window cranks awhile back and had them on but they kept coming off. It seems like there is not enough of the stock extender and so when I bolt them on and turn them they come off.

Just let me know,
Thanks.

with all the Pimpin` your doing to your car why not switch to power windows? there are kits available out there.