changing those rods are fairly easy, to take them out apply a little bit of heat with a heat gun to the rods then you should be able to take them off with a pair of pliers, DO NOT use a lot of force when unscrewing the rods as it may damage your threads, put the new rods back in using a bit of two part epoxy glue for a tighter fit.
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Shaun,
Thank you for your early morning response..I think the rods had been partially in the chrom bath, so I am not sure whether there will be something left "to screw" in, also I don't want to create a bigger mess. I bought the two bezel from the Netherlands and paid a quite fair €-amount for it...
I am just worried about the fact that there are different sized rods on such a bezel..Why would that be?
Rookie mistake, I should have measured before buying.