Sorry if this isn't obvious to me guys, but I just bought two new body posts. They are incredibly tall, and obviously, I need to cut them down for my pan car. My confusion lies in the fact that, at the top of this tall post, is the drilled hole to fit the clip through, and the threaded part. So, if I trim them down to size, I lose that hole and the threaded part of the post??? Also, theres a plastic piece that threads onto the top of the post???? HELP!!!!