We install the buckle using 2 removable Chicago Screws to match the buckle. We do this to allow our customers to install their own buckle if desired. (On the subject of Chicago Screws – I suggest you make certain they are tight, now and then. They are known to back out on occasion.)
I put a little Loctite on mine to make sure they don’t come loose. Use the “Blue 242” Loctite and you can remove the screws if you wish. You can purchase Loctite from your local hardware store, Home Depot, Lowes, etc.