Rega RB300 tonearm VTA adjusters


I'm planning to install a VTA adjuster for my Rega RB300.
Which is considered more accurate ? J.A. Michell or isokinetic ?

1. http://www.ebay.com/itm/REGA-VTA-ADJUSTER-FINGER-NUT-BY-J-A-MICHELL-/330315748008?pt=US_Record_Player_Turntable_Parts&hash=item4ce85a52a8

2. http://www.ebay.com/itm/ISOKINETIK-ISOVERT-VTA-ADJUSTER-PLUS-SPEED-NUT-FOR-REGA-/180685503343?pt=UK_AudioTVElectronics_HomeAudioHiFi_Turntables&hash=item2a11b1fb6f
triskadecaphobic
Interesting. I think you should call Pete Riggle. He is a nice guy and might be able to help you.
I called Michell Eng and they agreed that I'll send them back the VTA adjuster together with my original nut. They'll speachialy produce a VTA adjuster that will replicate the thread of the nut that I have.