Senior Member
Join Date: Oct 2016
Location: Cambridge UK
Posts: 854
Bikes: 1903 24 spd Sunbeam, 1927 Humber, 3 1930 Raleighs, 2 1940s Sunbeams, 2 1940s Raleighs, Rudge, 1950s Robin Hood, 1958 Claud Butler, 2 1973 Colnago Supers, Eddie Merckx, 2 1980 Holdsworth, EG Bates funny TT bike, another 6 or so 1990s bikes
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Flint catchers
They were a feature for tub fitted bikes for the roads in the UK BITD where there is a lot of flint kicking onto paved roads. They were for smooth no tread tubs tires only and were basically useless . I used them on tubs for years and with or without they made no discernible difference to me getting punctures.
You fashioned them from brokwn spokes and wire insulation with the wires removed.