Between today and tomorrow, I will try to make a video and I’ll do the picture with my EOS700D … so at least you can see it in a better way (when I work use only the phone, because oil with which lathes are always covered and their hands dirty) .
How to play? plays discreetly but nothing more, the protostar or yoyo like (eg Magicyoyo D5, fantastic!) definitely play better, it the weight of the rings is placed in a better position and more functionally, here is a bit too inside, close to the center of gravity and not by a huge advantage.
Compared to the original Onestar plays a little better, but nothing shocking, considering all the work done (but Aesthetically speaking, however I think I’ve got a really beautiful yoyo!). I would say that basically does not worth it … but it was not the goal I set myself prefix and at the end I managed to have no one but two successes.
The first is that you have not got a worse object to the original and this is not a thing at all obvious!
The second, the most important, was to confront various critical stages of the process, have them run at their best and have been successful in all of them.
these stages were:
- Lightening the weight of the cups: when working on objects that you do not know the project, sections, thicknesses is always very delicate going to remove material, it takes little to exaggerate and broken the piece … there are tools to measure the thickness, I a micrometer hundredths but not always the most get to where you need to measure.
- Creation of the Rings: here the problem was not so much create two identical rings with each other and of the same weight but realize them with a tolerance such as to allow the exact placement of the housing shell, not too excessive as to prevent the correct entry or vice versa to prevent the correct anchor. The problem is that the do not ability to tests… you have only one possibility, only “right first time” or otherwise you have to redo the rings (if too small) or you have to throw away the shell if too large because trying to insert the rings cut and drag them under the plastic
- Inclusion of the Rings: admitted he guessed the right measures the sida has not ended because forcibly insert rings in the shells is not a simple operation … at least put them straight! in this case the first ring came perfectly, I almost amazed at so easily … but the difficulty which saved me the first has presented me with interest the second … entered wrong three times and only the fourth we managed to insert it properly; I sweated cold for a few minutes and the frustration of seeing the whole job (4-5 hours) thrown away is not pleasant (something already happened many times)
With all this sermon I want to explain and reason about absolute and total difference of approach to work you have using the manual lathe than the CNC lathe.
With manual lathe is not designed before the piece on the computer, already knowing when I will get weight, that thicknesses I have, etc.
with manual lathe critical phases will not run in the “virtual world” and then we start with the real work with almost total security of the result … that is why it probably I has appeared often argumentative, because sometimes I read things that do not the slightest sense, written by people who are considered the Masters, Gurus … but that’s another story that has nothing to do with this. 
P.S. yoyojam is realy Master in this world!
P.S.2 in the video of Ceriani, which I imagine you will not understand, being Italian, the owner of the company (with which you can directly talk if the phone, he always answers!) explains the different models available (David 201 with manual advance, David 202 Automatic with automatic advance in 2-speed, David 203 with gearbox Semi-Norton with automatic advance to 4 speed and ability to thread and David 203 Vario some as 203 Semi-Norton but with the inverter and a much greater range of speeds), explains that totalemente parts are made in two Italian smelters (larger parts and structural in Gavardo, the smallest in Cellatica) and in the end it makes you see a cut of the material with the advance that their thicknesses, under normal conditions they do not even with a lathe to 20-25 quintals, and all without vibration or problems.