With regards to Rega arms, do Linn have two different composite armboards. One for the old Rega single point mount e.g. RB300 and one for the newer 3-point mount e.g. RB330 OR do they just have a single Rega armboard where you have three blind holes that you have to finish drilling out yourself if you are mounting a 3-point Rega arm i.e. a similar process to what you have to do for the Ittok arm rest.