Walt-MT
Member
Hello the board!
I'm in a jam with an 1860 Army after a broken cylinder bolt replacement.( Uberti made, date mfr. XXV = 1979 ?)
Prior to the bolt spring breaking, this arm fired incredibly smoothly and had been tuned by someone; it worked well.
The new bolt is fitted and moves freely on the screw and actuates when the cam on the hammer slides past it. I don't seem to be able to time it closer then an eighth of a cylinder turn before the lockup. This is galling and dragging the cylinder terribly.
This is followed by the bolt apparently not releasing this cylinder before the hand (pawl ?) puts tension on the cylinder so that when the bolt finally clears the slot the cylinder will spring past the next chamber position. I suspect bolt fitting here is incomplete.
I have run out of knowledge; how does one retard the lifting of the bolt to a point closer to or within the cylinder notch? I am concerned about over-filing the left side of the bolt (when looking from the top) but can't see another way or another cause of the cylinder being preloaded by the hand and then releasing too far.
As a last question, 1970s production Uberti... 12 - 28 threads are too loose and modern Italian metric are too big.
The major diameter on the existing cone threads is approximately 0.231 as compared to new Treso nipples at 0.215 for 12-28 ?!?
Any help would be greatly appreciated as I am supposed to demonstrate with this gun this weekend. (not looking likely)
Thank you,
W. Abbot
I'm in a jam with an 1860 Army after a broken cylinder bolt replacement.( Uberti made, date mfr. XXV = 1979 ?)
Prior to the bolt spring breaking, this arm fired incredibly smoothly and had been tuned by someone; it worked well.
The new bolt is fitted and moves freely on the screw and actuates when the cam on the hammer slides past it. I don't seem to be able to time it closer then an eighth of a cylinder turn before the lockup. This is galling and dragging the cylinder terribly.
This is followed by the bolt apparently not releasing this cylinder before the hand (pawl ?) puts tension on the cylinder so that when the bolt finally clears the slot the cylinder will spring past the next chamber position. I suspect bolt fitting here is incomplete.
I have run out of knowledge; how does one retard the lifting of the bolt to a point closer to or within the cylinder notch? I am concerned about over-filing the left side of the bolt (when looking from the top) but can't see another way or another cause of the cylinder being preloaded by the hand and then releasing too far.
As a last question, 1970s production Uberti... 12 - 28 threads are too loose and modern Italian metric are too big.
The major diameter on the existing cone threads is approximately 0.231 as compared to new Treso nipples at 0.215 for 12-28 ?!?
Any help would be greatly appreciated as I am supposed to demonstrate with this gun this weekend. (not looking likely)
Thank you,
W. Abbot
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