Awesome! Your research and pictures will definitely be helpful to others!

Ok, I have finally had a chance to finish this boring subject off. Based on suspicion of the original petcock I spent some time going through my old parts and those of offerings for sale online as well as basing both new available parts and NOS parts I have purchased and concluded the petcocks I am working on are stock devices. The TK, or Teikei company supplied these products and the logo is cast into the petcock, all parts obtained from factory fit and old versions out there all have both reserve screen and sediment collection bowl screens.

My modification was fairly simple, maybe a bit delicate but not impossible. supplies I used are below and some pics too of the process. Since I failed at the step by step pics because of a user ignorance I only have a few but should suffice. There is one pic of the petcock installed with factory fuel line and clips, WITHOUT an inline filter, just because I like it like that, the whole purpose of going through this ridiculous amount of time. Keep in mind, the whole time I'm engaged in this I'm updating friends and I received nothing but grief since you can buy repros on Ebay for 10.00, with the screens...

Supplies:
1- 3/8" brass tubing from hardware store (I ordered 10mm OD thick wall from onlinemetals.com but still not here yet...
2- 180 mesh brass screen from Ebay
3- End cap disks cut from splitting the tube, flatten and shape. (just flat 10mm disks)
4- Flux (for electronics)
5- Solder (for electronics)
6- M10x1.0 taper tap
7- M10x1.0 die

Tools:
Drill motor for drilling and die cut, chuck the brass tube, slow speed, etc.
9mm drill
Soldering equipment (for electronics)
Dremel with cut off wheel
320grit paper to prep brass
ignition files
zip ties
acetone

Steps:

1- Cut length of brass
2- Chuck brass in motor
3- Cut threads until brass flush with die exit
4- Remove brass from drill motor, flip 180, cut to length with Dremel
5- Clean up sharps with file while rotating
6- Repeat for above for 2nd pc.
7- Sand area to be soldered, set aside
8- Measure and cut brass mesh, I used a 2mm overlap at seem when wrapped around the 3/8 tubing
9- Hold wrapped brass mesh tight on surplus brass tube with mini zip tie, lightly
10- Lightly flux seam
11- Solder seam very sparingly using 625F
12- Cool, slide down tube till overhang by 2mm
13- Fold over the overhang to end of tube and flux lightly
14- Now release zip tie with solder iron, gently
15- Remove "screen tube"
16- Insert prepared 'disk' into tube, forcing into position with 9mm drill
17- Solder disk into place sparingly
18- Cool, insert prepared threaded fitting in opposite end gently
19- Flux and solder fitting to screen sparingly
20- Cool, rinse by swirling in cup with acetone to remove any remaining flux

Your correct, best solution. After searching without luck I did this.

Thanks DEET for the common sense solution.

WOW ! JUST WOW !!!!!

I use this one sourced from EBay, "OMG Made in Italy replacement petcock filter screen 9mm diameter X 52mm long". It;s even rated for ethanol gas although I don't use the stuff. You need to reduce the diameter slightly for a good fit into the pertcock. Keeps the crap that settles at the bottom of the tank from getting to the carb.