Anderson servo spares

[badger5]

I have an Anderson servo which has sheared the output driveshaft even though there is no other damage to any steering parts. I find this failure surprising as the servo is rated at 20kg which is way over what I need in my Cat K1.
Schumacher are the distributors for these servos, and I emailed them a couple of days ago but so far no response.
Looking on the Schumacher website I cannot find any spares listed, does anyone know if you can get spares for these servos? Are these servos any good?