drive repair tips?

[der Mouse]

>> three-bladed Phillips ["tri-wing", apparently]
> I've seen those used on airliner wings -- 737 perhaps.

I have a Nokia cellphone wall-wart charger that is held together with
such a screw.  (So far it's the only use I've made of any of the
tri-wing bits - taking that apart out of curiosity.)

> Sounds like all you're missing is Bristol Spline.  [...]

I don't think I've ever seen that, neither driver nor screw.  Perhaps
they're more common on the European side of the pond?  I seem to recall
Tony talking about them a lot.

> [...]; if you need to undo a Bristol spline screw, you'll need the
> real tool.

The description makes it sound as though a flat-blade bit should work,
if it's the right width to fit snugly into a diameter of the cylinder;
it should fetch up against two of the splines, and while it likely
would bend them out of true, it seems it should drive/draw the screw.

Or have I misunderstood?

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