Quick Compo - 2k vs Pre-2k Cockers

[Cdn_Cuda]

Most the updates should be up already! If there’s any questions or corrections post away!

[Pump&Run]

This is a well put together thread. I look forward to the updates!

[Cdn_Cuda]

Found two more pre-2k cockers and I’ve updated the thread with more info and more pictures!

[Daltech]

Awesome write up guys. Very helpful reference and pictures. Thanks.

[Cdn_Cuda]

Thanks for adding! Great info and pictures.

[Magmoormaster]

I'll add a bit to this.

There are essentially 3 different step changes in autococker design; pre-97, pre-2k, and 2k+. Pre-97 bodies have smaller valve chambers (see photos below), and lack the threading for the IVG. From the factory, they also lacked threaded timing rods, detents, and the lug adjustment hole. 97-99 bodies had these, but still had the smaller banjo bolts. 2k+ bodies have the new banjo threads, and came with new back blocks with shorter bolts. Small milling details happened with each generation, but they're much less important.

Here are some cutaway bodies showing the different sizes of valve chambers with each model:


Pre-97


97-99


2k+

[Cdn_Cuda]

Thank you for correcting that and adding more info.

[latches109]

To put things all together, here is the 2k and Pre-2k hammer to cocking rod assembly:


Please ignore the strange spacers on my 2k cocker’s cocking rod. It came to me like that.

This is inaccurate^^

WGP moved to threaded IVGs before the increase in banjo size. Pre-2k bodies can have threaded or non-threaded IVGs.
You can use a non-threaded IVG in a 2k bodies. For example, I use a Belsales rex dialers in many 2k bodies.

IVG weight is negligible when you use an aluminum non-threaded IVG. (OTP made one)
non-threaded bodies have a slightly smoother finish in the lower tube.




The banjo size is really what those terms refer to, wether it was

Pre-2K = 3/8-24 threads
2k = 9/16-24 threads



within the pre-2k group there were a lot of design revisions / editions.
for example pre-95 valves were smaller with shorter valve springs. Stock WGP valve port size increased over the years.
Pre-2k VASAs are squared off - 2k VASAs match the body bevel.

[Hellion360]

Nice overview!

[shooter311]

I love theses knowledge dumps. I feel like I knew all this info, but it is definitely the first time I have seen images of everything side by side.

[Hellion360]

The earlier Pre-97 autocockers there is often a smaller valve chamber size as well.
These like a shorter valve spring.

[Cdn_Cuda]

Past the hammer, the valve is the same for both markers. There may be a difference in pre-1997 bodies, but I have no experience with them.

Here is the power tube for both 2k and Pre-2k from valve spring to cocking rod:


And for reference, I’ll note that there are two different valve sizes for cockers/snipers. The 9/16 valve as shown above, for most Pre-2k and 2k bodies, and there is a larger 11/16 valve for 2k5 bodies (half block Black Magic etc) and Trilogy cockers:


The 11/16 valve does not require the use of the valve retention nut and can be disassembled without the use of a cocker valve tool. For the 9/16 valve, so most Pre-2k and 2k bodies you will need a cocker valve tool to remove this nut to access the valve.


And just adding in my early pre-2k valve compared to the standard cocker valve for reference:

[Cdn_Cuda]

To put things all together, here is the 2k and Pre-2k hammer to cocking rod assembly:

Please ignore the strange spacers on my 2k cocker’s cocking rod. It came to me like this.

my two other, non modified Pre-2k cockers have slight different internals, with the older version having full Sheridan internals and the new one having a stand cocker hammer, instead of a Sheridan hammer. The newer cocker has a very different valve though.

[Cdn_Cuda]

Now jumping back to the bodies again, these was one major thing I forgot to mention due to having a modified pre-2k body: ball detents! My modified pre-2k body has been drilled for ball detents. My other two pre-2k bodies do not have any.




Next we’re going to look at the hammer lug adjustment hole. Later model Pre-2k bodies will has this adjustment hole, but earlier models do not. Without having this adjustment hole you cannot adjust the hammer lug, which needs to retract to remove the hammer from the body.

Pre-2k bodies with hole and without:



Hammer Lug Adjustment hole:

[Cdn_Cuda]

And let’s look a those IVGs now. There is a sizeable difference between the three IVGs, with the 2k being much smaller and lighter. The early 2k is also needs different springs and is harder to adjust.





In these next shots you can see the insert used to adjust the tension on the spring for the Pre-2k IVG. This version of the IVG is compatible with standard cocker main springs. The older version is not compatible with standard cocker springs and spring need to be trimmed to change velocity.




And simply because I have room here, here’s a comparison of the 2k and pre-2k bolts. They are interchangeable as long as you use the matching back block (pre-2k back block with pre-2k bolt, 2k back block with 2k bolt):