A few times when we have bought mast extensions we have had a problem. The problem is that, for extra resistance, durability, or both, the mast extensions come with a pin that goes through the cylinder at the bottom of the tube. The trouble is that power-joint mast-foots (mast-feet?) that have a long pin will be too long to click in. Most of our mast foots have a long pin since these are more comfortable to fumble into the mast base than the short ones. What you need is a short pin mast foot. Just make sure that when you are buying your mast-foot and extension, they are compatible. It is one of those small details that you don’t think about and only realize when you actually put the two together.
The mastfoot pin is 2cm too long past the pin (und the number 4)
The pin on the left is 3 cm shroter that the one on the right. So it would work for the mast extension.
