"James Hanley" wrote in message
m...
Where in the uk can I order a steel scale to measure my screws
accurately from below the head?
like this one http://tinyurl.com/6lgmj

Try: http://www.buckandryan.co.uk/ In my opinion the best source.

How would I go about cutting screws to make them shorter, would a saw
ruin the screw?

Run a nut on to it, apply a fine hacksaw, unscrew the nut, file the end into
a dome shape.

what screw is best for screwing into steel? alu, brass, steel? It'd
be good if the screw didn't conduct electricity.

Use Nylon screws.

thanks