из мануала:
Non-compatibility
Do not mount HammerSchmidt to an ISCG adapter device. ISCG adapters do not provide enough structural integrity to handle the weight and loads applied by HammerSchmidt. ISCG adapters are only intended as a means to mount chain guide devices to non-ISCG frames; make sure you keep it that way.
http://magicmechanics.com/hammerschm...idtEnglish.pdf