Track pin fitted OK and working fine..
A couple of comments.
On the plus side:
The track pins are a consistent, 1.25mm. The originals are closer to 1mm.
1. This made them an excellent fit in the existing holes.
2. Presumably because of the improved fit, the action is noticeably quieter than the other buttons. I may replace them all.
On the downside:
1. They are, about, 25% bigger than the original pins. This may be the reason why the replacement was a bit of a bugger to close. Or, it may be that they are made of harder steel. I could not get it past about 75-80 degrees. The originals show a few degrees of over bend.
2. I didn't take the points off before I closed them. I am going to need to buy some fairly agricultural side cutters that can get in the space and cut through the steel, without destroying themselves. I am not going to risk my trusty old Swedish steel, side cutters on it.