Audiofeil and Bob, You are both correct, as I already conceded to Bob. BUT since the headshell of the RS-A1 could in theory remain tangent to the groove at all points on the record, the designer claims that no skating force is generated. I would agree with you if you were to respond that the arm probably does not accomplish that goal perfectly in fact, due to friction in the bearings, etc. Now, as for a headshell that is not offset, there WILL be one point on the record where skating force does approach zero, but only one point. And Audiofeil, according to the references I read, the skating force is not due to "centripetal force" per se; it is due to the force of stylus drag (Fsd)and is equal to (Fsd X sin of the angle from tangent). So, when the angle from tangent is zero, the sin of the angle equals zero, and skating force disappears. I am very sorry for placing incorrect info on this thread in my previous post.