Parker Hale stuck carbine nipple

[Float Pilot]

I am still trying to get my 1861 Enfield carbine to shoot... and one big problem is that the musket size nipple is REALLY STUCK.

To make matters worse back in 1974 when Parker hale made the darn thing they used a sloped sided nipple. The square part that is supposed to be engaged with the wrench is sloped like a pyramid.

I have soaked it for a couple days in PB Blaster... Even WWII bore solvent...
I also made a four sided wrench..... All that happened was that I eventually rounded the corners of the nipple...

Right now it is out in the shop with the barrel full of Marvel Mystery oil in another attempt to soak the threads.

 

[Acorn Mush]

You might try soaking it in a 50/50 mix of acetone and automatic transmission fluid for a few days. Another alternative strategy would be to alternately heat and cool the bolster area where the nipple screws in. I would suggest flame application from a propane or Mapp gas torch followed by a quick cool-down in icy water. Heck, if you can get dry ice, applying it to the nipple after heating the bolster might work even better. Repeated expansion and contraction of the metals at the threaded joint should eventually break the rust loose enough to allow a light oil or the aforementioned acetone/ATF mixture to penetrate, which would then enable you to remove the nipple.

Good luck.

 

[zimmerstutzen]

My theory, that has worked on a few occasions, heat the breech area up, not super hot, but to a couple hundred degrees. Have flipped upside down. Apply an ice cube to the nipple only steel/iron only expands and shrinks so much, but shrinking the nipple slightly in the hole should loosen it.

I have repaired a few old double barrel shotguns, and had to drill out nipples more than once. Sounds like it is almost a useless goner anyway.