The question is often asked whether one manufacturers bushings can be used on another's pen. The real problem is finding a set of bushings that are the correct size. It seems that there is no dimensional control of their diameters, and no manufacturer is any better than the others.
An example is the 7mm Slim-Line pen. The diameter of the pen fitting at the tip is a constant 0.329" to 0.330" for all manufacturers. I have no idea what the target bushing diameter should be, but the ones I have measured vary between 0.321" to 0.346". And then we wonder why everyone has a problem with getting a good fit between the wood and the fittings. If we get a set that is right, and they are all the same within the set, we can consider ourselves lucky. I haven't found the bushings for the other kits to be any better.
Some have solved this dimensional problem by making their own bushings. I solved it by not using the bushings for a diameter control of the wood, and turn to a diameter as measured with a dial caliper.
An example is the 7mm Slim-Line pen. The diameter of the pen fitting at the tip is a constant 0.329" to 0.330" for all manufacturers. I have no idea what the target bushing diameter should be, but the ones I have measured vary between 0.321" to 0.346". And then we wonder why everyone has a problem with getting a good fit between the wood and the fittings. If we get a set that is right, and they are all the same within the set, we can consider ourselves lucky. I haven't found the bushings for the other kits to be any better.
Some have solved this dimensional problem by making their own bushings. I solved it by not using the bushings for a diameter control of the wood, and turn to a diameter as measured with a dial caliper.