This sometimes happens with fully machined rings. We usually insert the cap screws into the saddle and pull the saddle apart a bit with fingers by pulling on the screw heads. If the rings are too stiff for this process, you may not be able to use RingTrue™ Tape without lapping the rings. This is one reason we favor lapping rings before applying RingTrue™ Tape – the lapping process slightly increases the ring diameter.
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