I'm not sure how this got posted in the car audio section... If the scope was manufactured by a well established company, you should be able to get a new cap from them. If you cannot locate the manufacturer, you can move the other cap to the windage adjustment to set the windage. Then when you're finished, move the cap back to the elevation adjustment. Even if you use it for a shooting discipline that requires constant adjustment, it's unlikely that you'll need to use the windage adjustment for anything other than setting the zero.
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