On Sun, 10 Jan 2016 17:45:48 -0000, Malcolm Race wrote:

On 10/01/2016 17:37, Mr Macaw wrote:
On Sun, 10 Jan 2016 17:01:27 -0000, newshound
wrote:

On 10/01/2016 16:14, ARW wrote:
"Bob Minchin" wrote in message
...
Bod wrote:
Are there any luddites in here still preferring the old fashioned
slotted screws?
Furniture restorers love em and will usually buy up old stock. The
rest of us realise the poziheads are generally superior to use
especially where they won't be seen.


I would standardize all screws as PZ2s.

I wouldn't, PZ3 is a good intermediary before you get to coach screws.
And PZ1 has its place on smaller stuff.

As with everything, too many inbetweens. For example, why does a car
need 5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20mm bolts? Why not just
5, 8, 11, 14, 17, 20?

The sme reason as why the Rolls Royce Meriln engine used a 3BA bolt in
one situation - because it was the correct engineering solution

You don't need that many numbers. Where do you draw the line? A 3.78294572138mm bolt?

--
There's been global warming since the ice age.