MKS Chain Tensioners.

I bought a pair of these MKS Chain Tensioners, thinking they may be a solution to my drive train problem for my White Bike. Of course, they don't fit.

Although this information is no where to be found, the cavity, i.e. female section of the tensioners will accept a dropout thickness of up to 5mm. The dropout thickness on my Bare Knuckle frame is just over 7mm. Regardless, they're really fucking nice. They adjust via Allen wrench, which is kindly included alongside the wacky Japanese instructions.