Hope you guys can help me out, I am restoring a car that has a universal joint in the gear change assembly. To re-plate the various pieces I had to dis-assemble the UJ joint which meant drilling out what I call a rivet type fixing as shown in the attached pics...I did intend replacing the joint with a nylock nut and bolt, but by query is, should the rivet be replaced with a similar type of fastener. IF so can anyone advise me what this type of fastener is called, so I could try and order some new ones.