Cocker front thread "repair" ... Currently 1/8npt ...

[XEMON]

Hello y'all,

I finally got all the major parts for my cocker build, and dug through my bins for small parts.

Found my stash of pre-2K banjo bolts 🥳
But a quick test fit felt a bit wired on the body ...
After further investigation and measurements/testing I figured out it has been re-threaded to 1/8npt.

I'm not 100% where to go from here ...
I could convert it to 2K spec (I have a tap and die for it) but I'm not sure how involved it is ... Is it just the thread or is there more to it?


any other ideas?

Thanks,
X

[Ecapnation]

Is it going cocker or pump?

[XEMON]

Its a cool ano with a matching front block so id like to keep it semi (and i have a cool cocker pump already 😅)

[Brokeass_baller]

Wait, the front block threads are 1/8 NPT?

[Jordan]

No... but 1/8"npt is also 3/8"-27 if you want straight threads vs. the tapered pipe threading, which is fairly close to 3/8"-24, aka pre2k-spec front banjo threads.

[Brokeass_baller]

Oh... That makes sense. I did not know that. Thanks!

[Ecapnation]

1/8 npt isn't to far off from 3/8-24... It basically just has a taper. It should grab

[anson]

I would tap the 3/8-24 into the body deeper and make a longer banjo bolt
or Drill and tap to 2k specs which is 9/16-24 and use a 2k banjo bolt and front block

[XEMON]

I like the longer banjo idea, but converting to 2K spect has me buying less tooling 😅
Any way to convert the front block too (the ano matched)?

[anson]

XEMON you can absolutely convert the front block to 2k specs. Hole has to be opened up to 9/16" then both sides spotfaced for the oring to sit. If you don't have a mill you can do all the work in a lathe with a four jaw chuck

[XEMON]

That seam very doable.
My lathe isn't quite big enough to fully mount the front block, but I can definitely do the front block on there ...

What's the print size on there?

[latches109]

I would drill and tap it 3/4-20

[Aididas78]

If you have a few banjo bolts to spare I would try running a 3/8-27 (1/8 npt) die over a banjo bolt. It should work and if it doesn’t at least you didn’t mess up your aluminum body.

[superman]

honestly i would just convert it to 2k spec and be done with it. If you want to send it out i can take care of it. I am sure someone on the west coast could do it too.

[XEMON]

I may take you up on that 👍

Someone helicoid the frame screw to absurd sizes, so I was gonna make custom screw to look a bit cleaner on there too, but I got injured to the point of not being able to use a machine tool for quite a while so I'm not sure when I'll be able to pick this back up 😒