Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
Twine tensioner idea:
This requires two holes in the arm, and two drywall screws.
1 Wrap the twine around the first drywall screw. This is your winch.
2 Pass the tag end of the twine through, and out the other side of the second hole, and apply tension to it to hold it in place.
3 With a screwdriver winch the string tight.
4 When sufficiently taut, place the second drywall screw into the second hole to anchor the tag end of the twine.
A2
Clik here to view.

Image may be NSFW.
Clik here to view.

Twine tensioner idea:
This requires two holes in the arm, and two drywall screws.
1 Wrap the twine around the first drywall screw. This is your winch.
2 Pass the tag end of the twine through, and out the other side of the second hole, and apply tension to it to hold it in place.
3 With a screwdriver winch the string tight.
4 When sufficiently taut, place the second drywall screw into the second hole to anchor the tag end of the twine.
A2