Kuzma 4Point vs Airline - is it worth the upgrade?

Jameswei: "In other words, the distance between the tips of the spikes must be exactly equal to the distance between the centers of the cups. They must not be off by even a little bit. I see from the first "2point" pic that one spike tip position appears adjustable since there seems to be a set screw for the spike."

Very good point, Jameswei. I think as long as one spike/cup contact is secured, the other one may fall wherever it may be in the cup and still not chatter, though not as elegant. Another solution is on the female side to be one cup and the other a groove and this way the tolerance need not be so tight. The Morch DP6 tonearm is a two point bearing design and one spike/cup is height adjustable in order to change azimuth. Perhaps the set screw on the spike of the Kuzma 4Point is for that too.

The Origin Life Encounter tonearm is also a two point bearing design that does not allow azimuth change at the bearings and they are factory set to ensure perfect contact.

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Hiho, I was not able to connect using your "Origin Life Encounter" link.

Perhaps you wanted us to see this page --

http://www.tonearm.co.uk/dual%20pivot%20explained.pdf

The Morch DP6 tonearm is a two point bearing design and one spike/cup is height adjustable in order to change azimuth. Perhaps the set screw on the spike of the Kuzma 4Point is for that too.

Adjusting one of the spikes to adjust azimuth has some problems. For one, it is a relatively crude adjustment. For another, adjusting it would very slightly increase or decrease the distance between the points (Pythagoras' theorem).

The 4Point azimuth adjustment is accomplished nicely via the grub screw in the bottom of the arm tube which is perpendicular to it, seen in the photo of the upside down arm for the purpose of showing the vertical bearing spikes. The section of the arm tube near the pivot is about 1 1/4" long, to which the rest of the arm tube is attached. Very fine azimuth adjustments are possible.

Yes, Jameswei. That is the link. I was very sloppy with my links. Thanks.

Here's the jpeg link explaining the Origin Life tonearm.

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Don't take me wrong but it seems funny to me that MF discovered the 4point as the last in the row :-) To have a fair comparison one needs to run both arms (Airline and 4 point) on similar TTs with the same arms and carts which I did. Memories from a test long time ago are not a great support for real comparisons.

best & fun only