A beautiful trick, certainly a good one to have down, [user]shalafi[/user]!
Today I broke in a new green Ozora, loving that process of smoothing the ken and roughing up the tama a bit, a good hour's session and I landed a few nice things too, including:
(String pinched)1-Turn Lighthouse > Lunar > In
Scoop Spike > (flip to) Lighthouse > Scoop Spike (Fast Hand Grip Switch to ken-grip)
...and something weird:
Hold the ken in ken grip with the inside sarado facing towards you (for most players Big Cup pointing right)
Pull up so the tama rests on the sarado and spike, preferably with the hole facing you (a kind of inside Frying Pan)
Let the tama roll down the full length of the ken (making a rattly, domino-race sound)
Fast Hand Spike the tama (it should do one Earth Turn rolling along the handle and one as it free-falls)