Uni-Protractor Set tonearm alignment

Dear Halcro,

After further engagement with the Uni-Protractor I can share your experiences. Especially regarding the "frosted mirror design". It is sometimes very difficult to hit the point. If I am using a lamp into the direction of the needle it helps a little to find the exact location.

regarding the P2S measurement I have made a suggestion in my answer to Downunder. At the moment I do think a two step approach, P2S measurement, then using the UNI , makes the most sense.

It is not a 9000 Dollar arm which comes in a 200 Dollar box, but you understand that this tool is designed for other purposes. Nevertheless I wish i had a wooden box to put in the fully build up Uni-Protractor just to take it out for usage when neccessary.

Best & Fun Only - Thuchan

Thanks Jazzgene and Downunder,
It's interesting to read all the first impressions as they begin to trickle in?
It seems there are some who like the full mirror whilst others may prefer a 'frosted' mirror? Personally, I never understood how to correctly use the full mirror in a parallax reflected mode so perhaps that would be an advantage?
As Daniel is now finding.......you can't satisfy everyone?!
Thuchan, who always strives for the best possible solutions, has devised a perfect way to utilise the supplied steel rule but his description is not as good as his photo of the solution (a picture is worth.........). Hopefully Eckart, you can find a way to post your picture?

I have been rethinking the steel rule comments and in Daniel's defense, there are many more turntables with 'fixed' tonearms than those accommodating changeable tonearms. I myself lived for 25 years with a Rega Planar 3 with a 'fixed' Hadcock GH228 so why would I worry about Spindle to Pivot dimension?
Of course in those days before the Internet Forums, I didn't even appreciate the importance of critical alignment?
And those of us who in fact do have adjustable tonearm mounting devices, would certainly already have a Spindle to Pivot measuring device already.
So I can understand Dertonarm's thinking here although something tells me that whilst the UNIprotractor 'arm' is not centred on the Spindle, there might be some mathematical formula which, when the micrometer is wound down to its minimum position, could still be used to check Spindle to Pivot dimensions?
Perhaps Daniel could consult with a mathematician about this?

This leads me to another question about the UNIprotractor.........if someone has a turntable with a fixed arm which had been incorrectly positioned by the Dealer or Manufacturer by say 2-3mm (which is very easy to occur), what effect does that have on the accuracy of the UNIprotractor?

Another question which gives me even more nightmares?.........if each arm is set according to a different geometry/alignment, how do those with cartridges mounted in interchangeable headshells swap those headshells between arms?
I certainly don't want to have to align each cartridge when I change headshells and then change it again on another one?
Life is for 'listening'.......isn't it?

maybe the simplest solution is to print an exact scale meter on the Uni-Pros arm and supply an extra transparent block using parallel lines and matching the layout of the Uni-Pro just at the spindle site . You may then put the extra block over the black round spindle positioning it exactly over the middle of the spindle and facing it towards the scale meter as I have tried with my Dennessen approach. You are then able to read the distance easily. No more Feickert, no more Dennessen necessary. Dertonearm may provide a modified Uni-Pro arm and the block as a substitution package.

Best & Fun Only - Thuchan

I was always thinking about how to combine my measurement suggestion with the Dennesson and also the alignment by the Uni-Pro. Therefore only using one tool!!! For me the quest is over! You may see the result on my page (last image)

Best & Precision Only - Thuchan