First make a loop.
Instead of a pin, use a thread (green) to loop
and stretch the (purple) thread.
Take the purple thread out in the first hole.
and down over the two purple bars.
When you reach the end
release the purple thread from the green loop.
Stretch the bar,
or let it form an arch,
or twist it to form a 'screw'.
Then anchor it.
Remove the green loop thread.
Add to these three samplers