I am thinking buying a Remington Model 51 pistol. In order to save money I might buy one that needs to have the grips replaced. Replacement grips seem to be available on the internet from multiple sources. But my concern is that this model appears to have the grips held in place by rivets. (I say "appears" because I have never actually seen one of these pistols up close.) The attached photo shows an example. The grips have the same round rivet heads on both sides of the gun. So what is the process to replace these grips? Is a special tool needed for the rivets?