Rik, I think you're correct- as I recall R3 points have metal L shaped bonding strips underneath at the pivot that are screwed to the moving rail and rely on pressure to contact the fixed rail (or it maybe the other way round?) I think there are other short bonding strips that connect up the fixed rails leading to the frog?
Anyway, before laying my R3 points I soldered short lengths of wire (2 inch ish?) to bypass these pivoting joints, from underneath so that they're invisible. There's enough flexibility in the wire to allow the rail to continue to move unhindered. Unfortunately I don't seem to have a photo of this mod to illustrate. I know some folk have soldered lengths of wire along the outside edge of the rail at this pivot point to do the same job, if perhaps not quite as pretty.
Anyway, before laying my R3 points I soldered short lengths of wire (2 inch ish?) to bypass these pivoting joints, from underneath so that they're invisible. There's enough flexibility in the wire to allow the rail to continue to move unhindered. Unfortunately I don't seem to have a photo of this mod to illustrate. I know some folk have soldered lengths of wire along the outside edge of the rail at this pivot point to do the same job, if perhaps not quite as pretty.