In the old days, the tv factory used self tapping screws and air driven
screwdrivers to fit them They were more or less socket hex type heads, but
many of the screws used for parts designed to be removed to get PCBs out or
to change settings or valves had also a pozi or Philips head inside the hex
outside. I even saw some with an ordinary slot which broke through the hex
part, but these did tend to fall to bits on insert since the slot
compressed and the drive slipped.
Even so trying to remove any of these in the filled with a screwdriver was
almost impossible due to the torque used to put them in and most engineers
had a socket set with them. Perhaps not as safe as an insulated screwdriver
around CRTs and capacitors that might still hold a charge, but I never
heard of a fatality!

Brian

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wrote in message
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On Thursday, 19 September 2019 11:58:49 UTC+1, George Miles wrote:
On Thursday, September 19, 2019 at 11:11:28 AM UTC+1,
wrote:
On Thursday, 19 September 2019 10:55:40 UTC+1, George Miles wrote:
what are those screwdrivers called
for consumer units and some electric sockets
which are a mix of cross head and flat?

[g]

pozi-slot

thanks ..

but why have 3 types?
pozi slot, phillips and pozidrive,
how annoying

[g]

there are loads of types. Ain't life fun. In the soviet union there'd be
one type and that would be it. But it would be a poor quality outdated
type & everyone would hate it.


NT