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
Yes Viridian,
I misspelled Triskaidekaphobic which is an album I like.
It means a fear from the number 13.
Man... and I thought my TT has attention to details :-P ...
I have an origin live vta adjuster which I find a major PIA to use. You have about a whole mm of surface area to grab onto which is basically flush with the top of the armboard. I don't have particularly stubby fingers so I could only imagine how much worse it could be to use. I wish I had the speed nut or riggle product if it was applicable.
The Riggle is easy to use. An alternative if you want something easy to use and a Rega mount is an Audiomods arm for about $1,000 new. I picked the Riggle.