Hold the phone, Doug. In order to make the Colibri mount-able on my Triplanar, I had to use an alu insert between the cartridge and the headshell. The insert, after I machined it to a minimum mass, weighs almost 3g. Then because of the insert, I had to use extra-long screws, which probably adds yet another gram or so to the mass at the very end of the tonearm, where it maximally affects effective mass. So the gross weight of the Colibri plus insert plus screws is probably not in the "light" class. So may be more comparable to the Urushi. VTF for Urushi in my system is typically 2g, for Colibri, 1.5g. However, I do take your point that cartridge mass and VTF, among many other things, will affect skating force. After I wrote what I wrote yesterday, I came to that realization independently; my first statement was incorrect. Thank you for saying so. These are the things that I dwell upon just before sleep sets in. I am much smarter then.
But then too, last night I listened to the Colibri WITH the brass anti-skate weight installed about one-third of the distance down the lever, from the elbow. I do believe it sounds (even) better with this small (by my standards) amount of anti-skating. The jury is still out on this; I have to do more listening. It could be that the Colibri is just waking up from long storage. But tracking seemed better, etc. I will try the O-ring trick.
But then too, last night I listened to the Colibri WITH the brass anti-skate weight installed about one-third of the distance down the lever, from the elbow. I do believe it sounds (even) better with this small (by my standards) amount of anti-skating. The jury is still out on this; I have to do more listening. It could be that the Colibri is just waking up from long storage. But tracking seemed better, etc. I will try the O-ring trick.