I would be surprised if you could.
Walthers of Milwaukee is the only authorized distributor of riv products.
If you are having a riv problem perhaps call the Walther's terminal hobby shop at 1-800-487-2467, Mike Fedderly, Parts & Warranty.
Should you want a riv product repaired, go to www.golfmanorhobbies.com
in Cinn Oh who is the authorozied repair station.