A light coat of grease and a light stretch running them through your fingers works well. Place in the groove and run your finger around several times until the stay seated. Drop the head on squarely, and rotate it back and forth a few degrees under slight pressure before lining up the holes. A smooth even feel indicates they are in the grooves properly. They should not shrink. What happend to me once is I got the wrong orings for my 250 (for a 200), A mistake by the old distributor. So if you absolutely cannot get them to stay put, just get new ones.
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