You need to find a copy of the DeHaas book, Mr. Single Shot's Gunsmithing Idea Book.

He covers the details of the different models, though not to the extent that he has for many of the rest of the single shots he wrote about (no scaled layouts of parts, for instance) but he does go into the exctractor, and making it work with rimless cases (almost all of the FBW actions were meant for rimmed cases)

So far, that has been the best info I have found.

After that, it comes down to finding one and measuring parts. I don't think there was any patents in place. Other than that, your main bet would be to track down one of the principals of the company that made them, and see if you can talk them out of the plans, or buy the rights.

Cheers
  Trev

(who kinda has the itch for a small single shot in a Hornet or K Hornet)

  I have a model J on my competition 45-70 and made a new ejector. It does not move to the side in the original design. I have some side view pictures of all five models of these (Fisk)  Falling Block Works actions. 
  Mine I got new in the box when I bought my gun shop from a fella in Valdez Alaska in 1980. The receipt had a price of 175.00 on it. It is made of 4140 chrome-moly investment cast and has one of the best simple triggers ever devised on it. Mine breaks cleanly at 13 oz. They have a rebound firing pin under a bushing in the breech block and no tang for easy stock fitting. They are at least as strong as a Winchester Highwall maybe more so with the improved firing pin design.
   I had to make a saddle mount for my tang vernier sight that sits on the back of the  action wrist just behind the hammer. Looks a lot like the one seen on Martini Cadets and is in fact were I got the idea. MD

Wow indeed!

Look at 8620 if you are interested in color  case hardening the action or parts, and 4140 pre-hard, if you are looking to skip heat treatment altogether. Both of those are most commonly found as round bar stock.
Neither is particularly cheap, but if you are going to put a lot of effort into it, the materials may well be the least expensive part of the project.

The DeHaas plans are interesting, though some of the designs are less than esthetically pleasing, to my eye. Good solutions to how to get the most out of a really basic shop, though.

Cheers
  Trev

Well, I have access to a wire feed EDM.............now I want to mill a slot in some Cold Roll and build a "proto type" to figure out, size and lengths of linkage and pin locations.......

Might make a hammer and trigger on the ProtoTrak, but first I need to figure all the Radius and angles...............and lever.

Speed Metals carry most of the 4140 [annealed], and they also sell it by the Inch.

I figured out how the ejector works, even found the rimless conversion in the RIFLE magazine.

OH DARN,............................already thinking about a 40-90!

Might have to make a bigger one!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Does it ever end?

Bruce

trev,

This might be a good reason to learn CAD, never too late!

By using the pin locations, you could size and shape the parts to fit!

Back to school!!!!!!!!!!!!!!!!!!!!

And I have a spare 40-90 barrel.

But first, I would like to build a 17 AH.

Bruce

i have three of the mod j and would like more. i saw some where on another site senior moment do not remember where some one tied to the maker had some parts etc but like i said senior moment i will look tonight to see if i can find where i wrote it down.
i have one of them in 32-40 one in 30 schwartz, and a majkor delima with what to do with #3 i just bought it last xmas, hasnever had a barrel in it and it is blued!
i do have a digital camera, and oh did i mention I am a tool and die machinist! ge if there are some numbers you need. let me know.
irish

trev, Thanks for the link to the pictures, I saved the to one of my 'Falling Block' folders!

irish66, Thank You, for your offer.......will send e-mail.

DWS8130, and a Thanks to you also!