This is a remix of LarkysPrints Watch Escapement Desk Toy.

https://www.thingiverse.com/thing:3364860

It replaces the 3D Printed main spring with a steel recoil spring from a chainsaw. These parts are readily available as spares on Amazon or Ebay typically for less than $10 USD. The specific part used in this build is a Husqvarna 545008013 Starter Spring but others could easily be adapted.

https://www.amazon.com/gp/product/B013TE9E5A

Let me start by saying if you're having trouble getting the movement to function using Karl's original design this will not help you or solve your running issues. You should debug/tune the original design before attempting this modification.

Run time is approximately 20 minutes.

You will need the following additional hardware
M3 x 12: 10
M3 x 16: 1
Recoil Starter Spring: 1

ASSEMBLY

• Fashion a loop at the large end of the recoil spring using pliers that will tightly fit the large central pin on the Mainspring Support front. Remove from the support pin, will be attached last.
  .

• Place the smaller/inner eye end of the recoil spring into the winding stem and secure with the M3 x 16 screw.

• Mount the Mainspring Cage front to the Main Spring Support using 2 x M3 12 screws

• Begin at the top of the cage and start attaching the Cage Back to the Cage front section using M3 x 12 screws, working your way down from top to bottom ensuring none of the mainspring is outside of the cage as you go.

• Attach loop from the recoil spring to the Main spring support pin.

https://www.youtube.com/watch?v=qTUOEiZxwWY