A.P. van den Berg - ST-Rods – the (un)folding CPT string!
Next to the AR-Rods and 2R-Rods, A.P. van den Berg created the Ø36 mm ST-Rods. Because these CPT rods have a self-seeking bayonet thread, they close effortlessly and require just a final, short, single twist to become firmly interlocked, hence the name SingleTwist-Rods ...