Yep, it is known design flaw.
If you have real solution, make 3D model and you'll get it made :-)
See out design contest topic.

@jaecjaec
I liked the clear, well-staged shots of the Follow Focus unit in your review. I also had an initial problem with the switchable gear wheel similar to what you found. Both the gear wheel and the metal shaft appear to be machined with a slightly flattened D-shaped cross-section, intended to prevent the wheel from rotating on the shaft. However, the wheel material is compressible enough that it can be forced onto the shaft without aligning it to the D-shaped flat spot on the shaft. If force-fit in this way, the pressure on the wheel from the shaft can make it difficult to remove. I was able to carefully pry the one in my unit loose with a flat-blade screwdriver, without damaging it.

Quick question for NF4 users (especially if you have also used the NF2). Does the fact that the NF4 no longer has a sliding horizontal adjustment plate like on the NF2 make any difference in terms of maneuverability, or is that plate essentially unnecessary in your experience?

Cheers, C

i have it, it's awesome

Yeh, well, maybe so but it is not exactly confidence inspiring when I point out the slippage issue mentioned here and they say that they ship with an extra NF1 fixed old style arm, "just in case". No returns either. So you are stuck if you get a defective model. What, they can't check it before they send it out from the factory?

I am speaking about purchases through ebay. I did not know that you still offer this through deals. On ebay it says they do not accept returns. When I spoke with Julie yesterday, she said herself that some customers still had problems with their units, which is why they include an NF1. In this thread there and on several others elsewhere there are people who are describing the same defect withe the swing arm....

The fuss is that if someone pays for a quick release arm, it's because they want one that works. Not a classical fixed arm solution. Two different things. In my case i do not want to deal with baseplate clearance issues in certain configurations. A quick release solution also enables quick flipping without having to remove everything from the rails.

The point is some people have the issue and some don't. What I don't understand is why they can't just test quality control before they send out. That seems strange, don't you think?

TrusMT has redesigned the pivot swing arm so it does not slip, they incorporated tapered pins, see photo. I have the new part and it works! I would contact (Julie) telling them you would like the new part using the address below. Mine came within a week. This makes the Follow Focus useable. trusmt@gmail.com

just to confirm that the new design is a HUGE improvement. just got an upgraded part and it works. it's rock solid now! can use my follow focus again! :) great service from trusmt... as always!

the lens always bulges.

It is not FF issue. I suggest to use lens support, good adapter, check camera base.

I am sure that we had discussion abotu similar thing recently.

@Greek_m43

http://www.personal-view.com/talks/discussion/3360/image-shift-while-focusing-with-ff#Item_13

Sorry, can't answer that one.

But I just want to tell all of you that TrusMT has excellent customer service!

For the second time they went to great length to help me with adjustable arm problems, fast, friendly and efficiently. I want to thank Julie in particular, who took care of my issue and responded to my mails in a clear and timely manner.

If a Chinese company cares that well for their buyers, it's leaving many sellers in the "west" far behind. Wanted to make that clear since there were so many complaints here about SLRMagic – obviously there are huge differences between individual companies just like anywhere else.

Plus, the latest version of the adjustable arm has cured the slipping problem completely.