Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,194
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
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Looks like you could use a few drops of tinted resin to create the perfect bobble profile atop the nut.
A plastic replacement "stone" will best be secured with a flexible adhesive, since it expands thermally at a very different rate than the metal.
I've always used silicone RTV to attach replacement Cobalto stones.