Rega RB300 tonearm VTA adjusters

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 ...

Regarding the 1 1/8 hole needed...
This is the tool for the job, right ?
http://www.ebay.com/itm/Irwin-10239-Unibit-9-High-Speed-Steel-Step-Drill-Bit-7-8-and-1-1-8-/300791331175?pt=LH_DefaultDomain_0&hash=item46088f7967

As far as the pictures can tell the isokinetik seems to be the only one made of SS where as the other ones are made of Aluminum.
An advantage, I think...
(The Pete Riggle is made of gold and diamonds :-) )

I got the isokinetik VTA adjuster for the Rega RB300 tonearm and found out that the thread did not fit the RB300. While the original nut fits the the thread of the RB300 beautifully the VTA adjuster doesn't.
Thinking it's a matter of bad thread I sent it back to the dealer and we agreed that he will ship me the "Michell" one instaed.
guess what ? ...The "Michell" didn't fit either !
Is it a case of both having bad threads or does my 1990 Planar 3 have a different thread than the one nowadays VTA adjusters are designed for ?

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.