[iggy_gim]

On the subject of linear actuators that can extend 12 inches, check this out:

http://dartactuators.com/

When is that set to be released?

Stroke refers to the distance the solenoid moves. In other words, when actuated, it can only move up to 1".

Thanks for that clarification.

But I would really like to know how to connect a chain to an aluminum channel. Or is using fishing line connected to a sand paper pulley better?