Unbolt the wheel first. Then pop the cap on. Reinstall the wheel. They are intended to be difficult to remove when the wheel is on the vehicle.

BenT
sent from my electronic leash

> On Nov 2, 2016, at 12:26 PM, David Bjorkman <ddbjorkman@VERIZON.NET> wrote:
> 
> Before I break anything plastic, is there anything I should know about installing a new plastic center hub in my factory 14" alloy wheels?  Grease? Sandpaper? Tighten it til it breaks and back off a quarter turn ;-)?  Btw, the nuts (and end threads) have been exposed to the elements.  Should I put a little grease or something on them?
> 
> Thanks
> Dave B.