Which tonearm?


I have a VPI Hw-19 Mk III with an armboard drilled for an RB300. I want to upgrade my tonearm but VPI hasn't written me back about armboards for the HW-19 and I really would rather not get another one. So if that's the case what tonearms can I get that would fit the armboard drilled for an RB300? I did read here that the JMW-9 has the same geometry but he had a Scout. Being a newbie, not sure if that applies to my turntable or not?

Another quick question. If I were to upgrade to the mk IV which has either a TNT platter or Scout platter, would I have to change to a thicker armboard because they're thicker platters? Thanks for your patience!
helmuthed
Thanks for the suggestions. I'm in New York so I'm pretty sure getting an armboard made can't be too hard around here. If that were the case, are there directions on how to make an armboard fit a VPI tonearm for example?

Mofi: thanks for the website suggestion... that could be another route.
check out the TransFI terminator linear tracking air bearing arm. Just google Transfi Terminator. Also a couple of good reviews here on Agon. It was a significant upgrade from the fully modded RB 300 i was using. It will fit your armboard.
Second the Origin Live arms as an option that would be a direct drop in to your exisitng armboard. I have made the move from the Rega to Origin Live and found a significant improvment in my system.