Sorry to spoil your fun. Metals will have no problem. But tread carefully with the standard rubbers, plastics or adhesives in your phono cartridge suspension or cable insulation. They may not stand the cryo temperatures. I've seen a cable catalog with special "arctic grade -20 ~+70degC" specification with unusual blue or yellow sheath; which means there is a distinction compare to normal cables.
Or better still, check with the manufacturer, he may let you into some other secrets too! happy tweaking.
Or better still, check with the manufacturer, he may let you into some other secrets too! happy tweaking.