cb750 k4 rear shock refurb????

[antonypo]

I was wondering if it is possible to have the shocks refurbished? Mine look a bit worse for wear and not quite straight somehow - if that makes sense? David Silver sells aftermarket ones for around £150 so is it worth the bother - if it can be done?
Are they as good as originals?

http://www.davidsilverspares.co.uk/CB750K4-FOUR-1974-USA/part_105740/

[SteveD CB500K0]

On my old 500/4 "Silver Machine", Frank Cooper (the previous owner and "OldBoy" on here) replaced the oil in the rear shocks by drilling and tapping a hole, draining and refilling them.