Thanks Ian,
In reply to your post above, I would say, the reason they could not get a .002" feeler under the nut is simply that the nut is way loose on the adjuster, which itself is .020" undersized on the thread and rattles around in the rocker when fitted. So, when you did the nut up it pulls the adjuster over at an angle.
Once proper on-size adjusters and nuts were fitted though, the angled gap between nut & rocker was very apparent to the naked eye.
BTW, these cast rockers came directly from MSC in the last month.
GR used to run these `forged' (were then) rockers in some race engines, but he is less enthused about them lately.
[EDIT]
Further to your comment on the 1.5 rockers above, the following was posted today on MiniMania forum by Motormay1969, and I quote:
"Ahhhh....science.
This is another case where a bit of measuring and comparison of the measured results paints a much better picture than words alone could. That said, following (below) are a few words on some of the history of 1.5 rockers as sold by the usual UK suspects.
Thanks to the ever-helpful DRMINI(of Oz) for his data and comments posted on this thread.
One of the earliest 1.5 rockers is the original 1.5:1 MSC rocker, designed by Keith Calver in the early 1980s. This was an investment cast component, was very accurate, gave the correct lift ratio, and was hard wearing. It had 'KEITH DODD' (owner of Mini Spares Center) cast in to it.
Sometime later, another rocker came appeared as the replacement for the previous one when the casting company that was making them got in to financial issues, packed up everything and moved without leaving any contact details. They took the tooling with them. As a result, Keith Calver designed a new rocker from experiences learned with the first rocker. This one was even better, except there was a batch made with insufficient heat treatment on the pad that caused premature wear. This was also an investment cast component and had 'KEITH DODD' cast in to it as well. It was distinguishable by the very different 'hooked beak' profile at the pad end.
Following that rocker in history is its replacement which came along when the tooling being used had worn out, so it was decided to do forged instead of casting. Manufactured in the UK by one of the foremost automotive specialist manufacturers, it was heavier than the previous two but proved 100% reliable and gave the required 1.5:1 ratio. It was decided to forge the rocker in this design so it could be used in historic motorsports series where non-roller rockers had to be used. The forging finish was left as forged so that to the untrained eye they look like the original 'S' type rocker. It had 1.5-1 forged in to the side of it.
The latest offering is sourced outside the UK. It is supposed to be a copy of the original forged 1.5:1 rocker, but is nowhere near the quality. Problems are inconsistently drilled/tapped adjuster screw threaded hole, adjuster lock nut land not machined square to the threaded hole, rocker pad does not sit square on the valve tip, ratio all over the place (generally around 1.6 - 1.62:1 on modded engines). Identified by having just 1.5 forged in to the side, and the pads are very smooth/polished."
_________________ DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. 
Last edited by drmini in aust on Tue Feb 05, 2013 8:02 pm, edited 2 times in total.
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