I bought my Yugo RPK from Century awhile back and just notice the rivet on the right side of the receiver where is holding the receiver to the bulge out part of the trunion is a little loose.  I want to crush this rivet a little more to make it tight fit, but don't have any special tools to do it.  I was thinking using the car hydraulic jack and some sturdy metal frame to crush the rivet.  Any thoughts would be appreciated.  Thanks.