I need a piece of aluminium machined as part of an optical Sight I am building.

Basic description ...

30mm external diameter, 140mm long tube with 2 sets of 4 holes at 90 deg around the circumference 35mm and 65mm from one end and tapped for grub screws (to be supplied with finished tube) The tube is have an internal thread at each end for a 'C Mount to M42 fitting'. I can forward a mount for your use and for fit confirmation.

The thread is nominally 1.000 inch (25.4 mm) in diameter, with 32 threads per inch, designated as "1-32 UN 2A" in the ANSI B1.1 standard for unified screw threads. (Whatever that means)

In use, this tube will house a 23mm diameter 'bullet' CCTV camera with the grub screws used to centralise and align it with the lens screwed into the C Mount fitting.

Anyone interested?