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Meanwhile I had some success with this type of tip in endurance tops (here).
"Pilot Pen 2269001F" is were I took them from.
The part I actually used is this silver colored one next to the brass axle.

The tungsten carbide ball itself, has a diameter of 0.5 mm.
Maybe for heavier tops one should use the larger size balls of up to 1.2 mm ? I am not sure.
The part of my idea in the first post of this thread, -the self lubing tip-, I never tried and maybe I never will, but it just could make sense with heavy tops and longer spin times.
 

I have a question about the traditional freestyle. 

In the the rules it says a traditional top is defined as a solid wood top with a metal tip. Does that mean that a plastic tip would not be legal?

No, plastic is not a traditional material.

I have a question about the traditional freestyle. 

In the the rules it says a traditional top is defined as a solid wood top with a metal tip. Does that mean that a plastic tip would not be legal?

The registration to this year world contest is open: https://spintops.org/world-spintop-contest/2021-world-registration/



Competitors registered so far:

1- Marcus Heineck, USA.,   O/T
2- Cleotilde Chingate Monrroy, Colombia, O/T/W
3- Beth Joyave, USA, O/W
4- Oscar Cortez Cardona, Colombia, T
5- Juan Henao Giraldo, Colombia, T
6- Jun Shimura, Japan, O

This topic, a gold mine of information on tip friction and air drag, has been idle for over three years. Its time for some new input.
Just yesterday I rigged up a scale to plot weight against RPM. A magnet above the top adjusts the weight. This can be measured in vacuum as well. See photo. I will post data from my trials.

Great experimental setup! Excited to see the results.

Yes, Texture, you are competitor #1!  Congratulations!

I saw you registered for both Open and Traditional freestyles. You will need two different videos this year to enter both.

PS: I corrected the thread title, thanks.

Me be lovin the sound on that bottle.  Happy talk like a pirate day, mateys!!!

Greeeeeeeaaaaaaaaaaaat!   

By the way, I think you mean 2021 registration is open? Rather than 2019?

Am I the first person to sign up?

The registration to this year world contest is open: https://spintops.org/world-spintop-contest/2021-world-registration/




Soon there will be translations in Spanish and Japanese (thanks Jun!) to the rules and registration page.

I still need to revise the ladder trick list.

If you find any errors, please send me a pm.

Who will be the first to register and become competitor # 1?   

By the way, this morning I connected by zoom with Japan, to test Jun, Kanta, Naonari and Tokku as freestyle judges so they can be certified ITSA judges.

A magnet above the top adjusts the weight. This can be measured in vacuum as well. See photo. I will post data from my trials.

My ultimate goal is the the longest spin time possible.

This is an interesting project, Bill !

In the past I experimented how to elongate the spin times both with the magnets and with the vacuum, but I never thought to use them together;  the combination of the two aids should produce extremely long spin times.