Just spoken to the chap at J.Blanch and will be popping over to see him in the morning.

He did raise an interesting point which I hadn't actually thought of..... that the travel on the pin might be excessive.

So, out with the digital vernier again.. on full travel the pins protrude from the face by approx 2.77mm on the left and 2.75mm on the right.

With the hammers down and the pins resting back against them, the measurements were RH 1.89mm & LH 1.69mm.

The difference between these is LH .88mm and RH 1.06 so the RH has an extra .18mm of travel.

Overall length of the pins is 20.40LH and 19.78RH. Maybe, although it doesn't protrude any further than the left, the RH pin has the ability to travel further gaining more momentum along the way.

My brain hurts.... but I still get the feeling that the stronger spring is the root cause.

We shall see........

atb
Fizz