Hello Mod BB, Gatty7 and Admin. DJ
This is an important topic - the replacement of the round adjusters.
I don't see the later block adjusters as being the best option,
given the quite different designs.
Gatty7, Mod BB is the forum's 45 expert, so I am confident he will
come up with a solution.
Cheers and welcome to the forums.
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Jack
p.s. that's a real flogged reel sprocket!
I don't think I have seen one that bad. It may be that the chain was
over-tensioned to compensate, thus destroying the tensioner.