Morch DP-8 arm on a Helix Two turntable

 

Is the DP-8 really a unipivot? I thought only the UP-4 is a true unipivot. 

No. The DP6/8 uses a dual pivot, similar to the traditional knife edge bearings in the old SME arms except that instead of knife edges it uses points and cups. Far more stable than a unipivot.

 one of which we can call a modified unipivot (Kuzma 4-point). As for me, I am a little suspicious of tonearms that started life as unipivot designs and later incorporated  very significant crutches 

The Kuzma 4Point did not start out as a unipivot - it was a "clean sheet" design, bearings in the vertical plain are similar to the Moerch - 2 points, one in a cup, 1 in a knife block. This is quite clever becuase the armtube is removable, and when you place it on the pillar assembly all you do is locate the point in the cup on one side, and then lower the other side which automatically finds the correct position. Long term I would surmise that if the cup wears, the point will self centre, and the slot on the other side allows for any change - very clever. 

If you use audio parlance - gimbal bearings, unipivot bearings, knife edge bearings ( SME SAEC ) both these arms are more akin to knife edge bearings than the others.

The Kuzma 4Point11 has the best, easy, repeatable, fine turnable VTA adjustment of any arm I have used/set up. If you have a collection of both traditional thinner records and 180g vinyl then easily adjusted, and measureable VTA is critical in my view so that evenif you dont do VTA for each record, at least you can have 1 setting for each type of record - 180g/normal

@dover thank you for clarifying, the Morch DP-6/8 is a dual pivot design and share some similarity to the knife edge bearing in vintage SME 3009 arms.
The DP-8 has VTA adjustment that isn't on their lower models, can you share your experiences on how well this work. What you like/dislike. TIA   

Can the OP share with the class...what arm did you decide on?

My original approach was to try and minimize the initial acquisition cost by using a less expensive tonearm than the Schroder CB11 or CB9. I used to have the UP4 long time ago, it was good and liked the interchangeable armtubes. However, I was apprehensive of the DP8 design and compatibility with the Helix Two. Finally, I decided to use the Ikeda IT345 CR1 short tonearm that I have on hand to start with and get a second armboard pre-drilled for the CB11. I will buy the CB11 at a later point when the financials allow and if deemed necessary. It is important for me to be able to change on the fly cartridges as I have multiple cartridges that I like to listen to (Skala, Frog, Orpheus and A90). Just for reference, the rest of the system is Ypsilon (Phono and Integrated amp), B&W 801 S3 Matrix and Yamaha NS 5000 speakers, Ideon Ayazi DAC and cabling from Ypsilon and FM Acoustics. All the best to all and thanks for the lively discussion.

Thanks for the clarification, Dover.