Tension spring replacement  

Tension spring replacement

Does anyone know alternative suppliers for the 5x15s tension spring? The kit doesn't come with a spare and I've already lost one of them due to the continuous tweaking I've been doing with the bearing/pulley assembly. Asking because Prusa shipping is killer to those in the US.

Also curious about the specs of the spring; I don't have equipment to test the compressed length @ max load. Managed to determine the following though:

od
*listed: 5mm
*measured: 4.9mm, 0.193in

id
*listed: -
*measured: 3.3mm

free length
*listed: 15mm
*measured: ~15.4mm, ~0.606in

wire dia
*listed: -
*measured: .8mm, 0.031in

total coils
*listed: -
*measured: 10

closed and square

EDIT: Here's the closest match I found through McMaster-Carr: http://www.mcmaster.com/#springs/=5cee7123f5584ceca20e56d4de754e02jmflm0vc
Unfortunately, there are 2 listings and like I said, don't know the compressed length @ max load. Halp.