You can contact Tasco directly through their web site, tasco.com. Depending on the specific Luminova model, virtually identical models are offered by Celestron and Meade. In any event, you should be able to get the replacement yoke directly from Tasco. Give them a call at (800) 423-3537and I would think that their customer service department will be happy to help you out. Replacing the yoke is pretty easy to do.