Butterfly Drill Guide & Dust Collector

Requires 2 x woodscrews  Ø 3 x 20 L

Recommend to print the Arm pieces on a raft if adhesion is required.

Mechanism may need fettling until it fits smoothly - see picture. 

Also, using a graphite pencil on the sliding parts will lubricate it, without attracting dust as grease would do.

FreeCAD source model included.  
(For the spring source model see https://www.printables.com/model/648602 )