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 press fit 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 (M3 grubs)

D.006 (Giuditta)

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

Details:
Delrin body, Diego guts system, C bearing, 6mm axle (M3 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