Its cast. And a heavy lumpAt least you've got one, I gotta make one for mine, is it cast iron or steel?
Never seen one. And trying to find one is probably impossible.That's exactly what it is, looks like a Hunton and worth a few bob if you had to buy one.
As discussed later, One use of for the stripper assembly. I've attached a couple of pictures. One from eBay that a guy was recently selling. this shows the complete setup. The are 2 options, using the swing arms or a combined rectangle mating part.Just out of interest chaps. Does anyone have a picture of what slid in to this slot...and what it was used for.View attachment 113577