a method for adjusting a radial gap between two parallel rotary tools used for converting a flat substrate , the method using a converting arrangement including a first and a second cylindrical rotary converting tool , each tool provided with two laterally spaced apart conical lateral rolling rings arranged to cooperate to convert the substrate ; a first and a second lateral bearing , holds the first tool for rotation ; a third and a fourth lateral bearing , holds the second tool for rotation ; clamping elements tighten the first to the third bearing and the second to the fourth bearing . the method steps include loosening the elements for tightening ; pushing the first bearing away from the third bearing , and the second bearing away from the fourth bearing along a predetermined distance ; modifying a lateral position of at least one of the rings ; moving the first bearing radially closer to the third bearing , and the second bearing radially closer to the fourth bearing , and retightening the elements for tightening .