the hinges on my Opel Camp (Vauxhall Brava/Isuzu TFS) pickup's tailgate are so loose the banging from the back is even driving this deaf old **Language** crazy. Anybody replaced pins like this? I can't find new hinges anywhere. I'd imagine boring them out and an oversize pin, plus grease nipple, would be favourite. I think the pin would need to be hardened?