Handcrafted yoyo experiments

In June, my friend Diego decided to start hand-turning yoyos.
He knows nothing about modern ones, so I gave him some advice and some spare harware I had collected over the years (bearings, spacers, strings, etc.). It turns out he caught the yoyo-prototyping fever and keeps producing one-of-a-kind designs. Whenever he finishes a new one, he gives it to me to try out, and then he tweaks it if needed.
I decided to make and keep updated this page to document his creations.

D.001

Specs:
Width 42,4mm - Diameter 52,3mm - Weight 74,6g

Details:
Delrin body, M3 axle, C bearing, aluminum screwed guts

D.002

Specs:
Width 34,8mm - Diameter 49,1mm - Weight 48,4g

Details:
Delrin body, M3 axle, SKF 4x15x5mm, bolted guts

D.003

Missing. (Modified to make D.010)

D.004

Specs:
Width 18,9mm - Diameter 54,9mm - Weight 50,2g

Details:
Plexiglas body, floating string seat with dual SKF 4x15x5mm, 12x neodymium magnets, M3 bolts

D.005

Specs:
Width 52,9mm - Diameter 54,2mm - Weight 68,7g

Details:
Plexiglas body, Diego guts system, C bearing, 6mm axle (M4 grubs)

D.006 (Giuditta)

Specs:
Width 53,7mm - Diameter 55,1mm - Weight 66,1g

Details:
Delrin body, Diego guts system, C bearing, 6mm axle (M4 grubs)

D.007

Specs:
Width 39mm - Diameter 58,3mm - Weight 48,4g

Details:
Birch ply body, M4 axle, C bearing, glued aluminum guts

D.008 (Volauvent)

Specs:
Width 51,1mm - Diameter 54mm - Weight 55,7g

Details:
Beech ply body, M4 axle, C bearing, glued aluminum guts

D.009 (Zebra)

Specs:
Width 54,8mm - Diameter 54,5mm - Weight 55,5g

Details:
Beech ply body, M4 axle, C bearing, glued aluminum guts

D.010

Specs:
Width 45,3mm - Diameter 53,2mm - Weight 62g

Details:
Plexiglas body, copper rings embedded in UV resin, M4 axle, C bearing, glued aluminum guts

D.011 (Bass-boost)

Specs:
Width 55,8mm - Diameter 58,5mm - Weight 41,1g

Details:
Beech ply wood body, aluminium caps, M4 axle, C bearing, glued aluminum guts

D.012

Specs:
Width 39,4mm - Diameter 55,2mm - Weight 39,2g

Details:
Beech ply wood signed body, 5mm fixed axle, fabric-based phenolic laminate bushing, Vulkollan response system

D.013 (Polka-dotted zebra)

Specs:
Width 54,5mm - Diameter 55mm - Weight 51,1g

Details:
Beech ply wood body, hollow, manually balanced CG with radial weights, M4 axle, C bearing, glued aluminum guts

D.014

Specs:
Width 56,3mm - Diameter 54,3mm - Weight 56,5g

Details:
Delrin body, M4 axle, C bearing, glued aluminum guts, solid silicone pads

D.015 (Black pearl)

Specs:
Width 58,1mm - Diameter 55,7mm - Weight 57,4g

Details:
Delrin body (diamond/M shape), M4 axle, C bearing, glued aluminum guts

D.016 (Ultra Light Competition)

Specs:
Width 58mm - Diameter 53,5mm - Weight 57,2g

Details:
Delrin body, SS inner rings, M4 axle, C bearing, glued aluminum guts, solid silicone pads

D.017 (hubless)

Specs:
Width 28,5mm - Diameter 58mm - Weight 67,7g

Details:
Delrin body, no axle, EZO 25x37x7 bearing, press fit

D.018 (Ninja)

Specs:
Width 53mm - Diameter 51,8mm - Weight 50,2g

Details:
Delrin body, 3mm fixed axle, stealth Teflon bushing 3,2x4,7x5, solid silicone pads 11x15

D.019

Specs:
Width 53,5mm - Diameter 55mm - Weight 47g

Details:
Delrin body, 2mm fixed axle, stealth Teflon bushing 2,1x4,4x5, solid silicone pads 10x14

Bonus

Equipment for balancing the CG of yoyo halves. Useful for materials with uneven weight distribution.

D.019 has a twin.