Helix rod for MB 146/149

Manufactured from high density black Delrin plastic, this rod has a circular cross section which is a much stronger alternative to the original oval cross section

Please copy the link below for a comprehensive description of this part from a renowned repairer of M.B pens. I think it is quite interesting, although i now sell a tool to remove the C washer without messing about drilling etc. 

I also make a tool for inserting the ring. A new ring is included with each helix ordered.

http://www.fountainpennetwork.com/forum/topic/276873-another-d-i-y-149-repair-pictorial