I usually make up my own extensions, (unless Servo City is doing a sale), those JR connectors are pricey though. I wish I had seen the Ashlok connectors, of course I just ordered from Dreamworks a few days ago... It looks like I can use my el cheapo crimping pliers with the Ashlok pins, they look the same as regular servo connector pins. But the el cheapo crimpers are a fiddle to use, it is hard to control the pins until you actually do the crimp, are the expensive ones any better?