Projects Linear Actuator for Landing Gear

Hey all,
Just wondering, has anyone made a linear actuator?
I'm understanding the principal involved and am thinking I may be able to make my own linear actuator to operate the retracts in my corsair.
Found the electric retracts a bit on the dear side, so figured I'd have a go at making my own actuator, and may have found someone capable of helping me make my own retracts as well.
 
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