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Silvie, you can pre drill holes through the rings and use these as guide holes. Then simple position the rings on the dove tail bar and use these holes as a guide. Then drill and tap the holes in the dove tail bar say about seven threads. Try to make the threads around 4mm or 5mm in width. Hope fully that will solve your problem, if you can post those shots we will have a better idea of how to combat the problem.
Paul.
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