I've got an old Diana Series 70 model 79 that seemed a bit low on power - so I chronoed it. 3.5 ft/lbs!!! Yeah - just a bit low... So I took it apart and found the leather washer and buffer washer at the end of the piston disintegrated when I removed them. The spring didn't appear to be too bad but didn't need any compression to get it into the body - the length just fitted right.

Any advice on where to get spares or get an expert to cast an eye over it please? Does the spring sound ok or has it lost its tension? I know it's not worth much but it has sentimental value to me. Situated on the Suffolk / Essex border but could post it or travel a bit. Thanks.