With Prestige Pro, the concern is, of course, that after adding silicone (and lead) it would become too heavy. But I wonder if anybody has tried this on Prestige S? Anything interesting to report?
I found silicone injected -- in the factory -- in the handles of Kneissl. This may account for the particularly nice feel of those frames.
Also, has anyone tried injecting silicone into the top of the frame (instead of lead), or at the 3 and 9 o'clock positions? Is it doable? Any downsides?