Adjust the lateral RF first using the screw behind the middle one (under the E in Fed). The take the outer bezel off the RF window and adjust the vertical alignment.
Adjust the lateral RF first using the screw behind the middle one (under the E in Fed). The take the outer bezel off the RF window and adjust the vertical alignment.
Screw the whole thing back in, fairly tight. Then heat the ring with a domestic iron or by moving a pencil-flame blowtorch around it for a couple of seconds (be careful after of course!). You could also try soaking the threaded part in a penetrating oil for a few days: apply a tiny amount where the bezel meets the prism housing, with it removed as per the photo.
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