Thanks guys. I will try the petrol soak to remove the mirror. I found a YouTube that used heat, however it wasn’t effective. My mirror issue is pitted chrome, not ball/pivot tightness. I was going to try to swap the top portion only (my old base is still pretty good). Does anyone have any tips for removing the ball/pivot friction joint. The replacement mirror has the pressure plate screwed in, not riveted, however I think the ball is two piece permanent thread-locked inplace. I took two visegrips to a previous one and couldn’t budge it (obviously destroying it at the same time - no loss as a tester). I tried to simply pull it straight off ( I remember doing this on and old Toyota crown and Holden), however she’s in there seriously, seriously tight.
Any feedback would be awesome. Or alternatively, any known (known will fit) vendors of a RH side mirror for a 70 (and a price if a club member) would be handy. Thanks 😁👍