Ox Mainspring No.6

The Worlds NO.1 square spring. The perfect replacement or upgrade for standard mainsprings.

No.6 FITS - HW77, HWand, Feinwerkbau Sport, Also larger original models if ultimate power required.

The NEW OX Accelerator mainspring is Furnace Bake-Coated with MOLYBDENUM & PTFE For Progressive Lubrication & Rapid Acceleration For Up To 40 per cent more compressed poundage than conventional mainsprings. Worth a little extra.

Remember that the number of coils and diameter are important, the old spring will be shorter as it is worn out. Remember the legal limit without an FAC is that it must be under 12 foot pounds. Requires some knowledge and tools to fit. May need to be shortened to obtain the correct legal power limit.