{TAIL ~ Transmission arrangement} 1, wherein said feeler roller is formed with a hub, has roller bodies disposed for rolling on said hub, and a race carried by said roller bodies, a ratio of a respective diameter of one of {HEAD ~ said roller bodies} to the diameter of said hub being such that said roller bodies, in said second operational setting of said second transmission linkage assume at least approximately the same relative position with respect to said race as in said first operational setting of said second transmission linkage 
{ TAIL ~ Transmission arrangement } 1 , wherein said feeler roller is formed with a hub , has roller bodies disposed for rolling on said hub , and a race carried by said roller bodies , a ratio of a respective diameter of one of { HEAD ~ said roller bodies } to the diameter of said hub being such that said roller bodies , in said second operational setting of said second transmission linkage assume at least approximately the same relative position with respect to said race as in said first operational setting of said second transmission linkage
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