Looks great Steve. I'd forgotten you are doing these - I need to sort something for my SME 3009 S2 Improved now I am running a Sumiko headshell, currently lashed up with two 50p pieces and some white-tack - it should be a fairly straightforward job, just a cylindrical weight with a thread and then a threaded piece:
Basically
this is the standard one, and it needs to be heavier. Is that something you would be able to do? (And rough cost - PM if you like.) Cheers!