If you put a dial indicator on the end of the input shaft spiggot that would tell if its bent. The bearing surface looks chewed out near the end. Also looks like your spiggot bush has been spinning whick is not good
Im about to put in a new koyo radiator and during my research came across Red Line Water Wetter
The claims and reviews give it decent thumbs up, naturally I bought some as an option
Anyone able to vouch for it?