What do you mean by "spin"? What's the aim?

Morevoer, while greasing the surfaces in the running should be the usual basic behaviour of all wheelbuilders, I never read about flexing the system to relax spokes e solve some twisting. It sounds a good doing which simulates the work of the wheel on road. But: once the spoke relaxes from his previous twisting, you have to face a new turn of truing and you are back to the start.

How about clamping spokes (as for bladed spokes)? And with what?