I have owned my deactivated SMLE for nearly twelve years now and in all that time the rear sight has been held in position with a blob of blutak to stop it flopping around as the spring that tensions it snapped many moons ago before I bought it:
After all this time, I have finally bought a spare spring, in this case marked up as being made by Lithgow in Australia:
Fitting the new spring turned out to be a little trickier than I expected, so today I am going to run down how I did it in case you ever need to replace one!
The first job was to take out the stub of the old spring. Firstly I undid the little screw holding the spring in place:
The spring is dovetailed into the sight base, so I then used a small brass bunch and a hammer to gently tap it out backwards towards the butt and I was left with the broken spring and the screw (hang onto this carefully as it is very small and easy to lose:
With the old spring out it was time to insert the new one and this is quite tricky. The send of the spring needs to be depressed to allow it to slide under the sight whilst you tap it in far enough to allow the retaining screw hole to line up. The spring itself is too stiff to allow you to do this with hand pressure and you don’t have enough hands to do it anyway! The solution I found was to use a G-Clamp to compress the spring:
To protect the woodwork, I made sure the sling was between the bottom of the clamp and the rifle to stop it damaging the surface. The top of the clamp is too wide to fit over the spring so I improvised and used a small socket wrench bit to bridge the gap:
With the spring depressed, I could gently tap the spring back into place and when the screw holes lined up, secure it back in place with the little screw I had retained from earlier:
The little star indicating Lithgow production is easily visible here and although my rifle is a British made example, the parts are all interchangeable and I am most concerned about getting the sights functioning correctly which they now do after over a decade of waiting!
This was a fun little project and I always enjoy it when I can repair something and get it back to how it should be. As gunsmithing goes this is pretty minimal, but it was fun to do and my rifle is finally complete again.