I'm looking for a screw type for my B&D jigsaw. the bit that holds the
blade in place. i have lost 1 of them and need to replace it. It's a
bit tricky with just 1.

The thread is like the screws used in electrical sockets, but what are
they called.

I took the remaining 1 to my local diy store who said they were machine
screws and not available.

Anyone know what they are called and where i can get them.

Many thanks.