Got my winter rubber put on at the dealer yesterday. They didn't know I had the center caps for the 16" steel rims in my boot, so they did not install them. Is there a trick to securely putting these on the rims? I tried pressing them in but it didn't hold up right. Here's what they look like:






I'd rather not return to the dealer for this...try to keep away from them as much as possible...


Thanks,
Mike.