IBM 5155 analogue display fault

[Gordon JC Pearce]

Tony Duell wrote:

> 
> I just pray you never get to work on a Feret. That thing is full of 
> System Zero screws which are similar to the reverse-torx, but not 
> compatible (and, indeed, designed to be difficult to remove with things 
> like  Mole Grips). Yes I do have the right tools -- I bought them to work 
> on my Feret.

Are those the ones that are much flatter than a reverse Torx, but with 
very thin splines and tapered so that pliers, moleys and the like just 
slide off?

Gordon.