Indeed, gadget beat me while i was looking it up, with the aid of a microscope
Pt# 114061 O-ring 6mm ID x 2mm NBR70
Source:
http://www.wdp.tv/e_blast07/140507-news/grease-lube.pdf Page 30/36
Cunningly, they seem to have flipped the shaft through 180* in the exploded diagram to confuse us
Yeah, there isn't one in the tool kit, and only 1 in the spares kit
As this seems to be a bit of an Achilles heel (though most of the time I have found that just cleaning the o-ring and re-seating it with a drop of Love Juice does the trick) if you find a supply I would be up for a few. I can't see that the new ram is much different, just a new hammer, when the Fly/Magno parts finally get here
While you're here, is there an update on your board software yet? Mine shoots like a beast with your board and one of Ralph's triggers.