We stock thousands of parts, however, sometimes we must order special parts. Repairs are not started until all parts are in. If a unit is sent on a 24-48 or 72 hour hot rush basis, and the repair is declined, you are responsible for a 200$ rush evaluation fee. Shipping and handling is additional. All units returned unrepaired are unassembled. A restocking fee will apply to cancelled or returned items. Any questions, please contact Customer Service info@ncservo.com