Webley Junior Air Pistol - help needed.
Posted: Sat Jan 25, 2014 7:07 pm
I bought a Webley Junior air pistol some time back - it worked well enough but the barrel joint screw ( part number J19) had been replaced by a large spilt pin (!).
Since then I have found a new joint screw and checked that it fits OK on another Junior but it will not to screw into the spring guide (part number J4) on this Junior - presumably the use of the split pin for an unknown period of time has damaged the screw thread inside the spring guide.
The barrel joint screw will turn into the spring guide about two turns but then it stops dead.
The usual tricks of trying to follow the screw thread grooves inside the spring guide by hand with a hardened point have failed , and easing the screw in and out trying to make small progress and then reverse to "break the chip" have also failed as the joint screw still stops dead at the same point every time so I need to find or borrow a "tap" of the correct size to run through the spring guide to clean-up the damaged thread.
The thread used by Webley looks to be a very fine and I have nothing like it in my workshop and I have no idea what it is.
Does anybody know what type of screw thread Webley used to cut these threads please? (about an M5 size).
Once I know what the thread actually is I can then start to try and find a tap of the correct size to fit it - unless anyone has a correct size tap that I can buy or borrow to clean-up this thread?
Please let me know if anyone has a suitable tap I can buy or borrow or even advise where I may be able to find one.
Since then I have found a new joint screw and checked that it fits OK on another Junior but it will not to screw into the spring guide (part number J4) on this Junior - presumably the use of the split pin for an unknown period of time has damaged the screw thread inside the spring guide.
The barrel joint screw will turn into the spring guide about two turns but then it stops dead.
The usual tricks of trying to follow the screw thread grooves inside the spring guide by hand with a hardened point have failed , and easing the screw in and out trying to make small progress and then reverse to "break the chip" have also failed as the joint screw still stops dead at the same point every time so I need to find or borrow a "tap" of the correct size to run through the spring guide to clean-up the damaged thread.
The thread used by Webley looks to be a very fine and I have nothing like it in my workshop and I have no idea what it is.
Does anybody know what type of screw thread Webley used to cut these threads please? (about an M5 size).
Once I know what the thread actually is I can then start to try and find a tap of the correct size to fit it - unless anyone has a correct size tap that I can buy or borrow to clean-up this thread?
Please let me know if anyone has a suitable tap I can buy or borrow or even advise where I may be able to find one.