With so many FIA Mk1 racer building their boxes, which laygear shaft you use for the 3 syc gear box while use in anger?
NOS or reproduction upgrade one?
I've purcahsed and (lab) tested a lot of them and so far (regretably) Mini Speed has the only decent ones for 3 synch. Not sure if Swifties does them the 3 synch, but their 4 synch shafts are also good. I always worry when buying from Minispeed, you hear nothing, but a few weeks later the gear does show up.
I tested them not only for Rc hardness, but depth of hardness & material. It is what they say.