A method for separating a light-emitting diode from a substrate comprises the following steps. The polyvinyl ether fluid have repeating vinyl ether units of the general formula \u2014CH2\u2014CHn, wherein R is comprised of a branched or linear alkyl group having at least 4 carbon atoms and n is a whole number representing the average number of repeating units in the polyvinyl ether. E\u2032 is a linker arm between G and Z. At least one of the frames includes a stop member able to co-operate with the other frame to limit the distance of longitudinal displacement of the main frame towards the auxiliary frame and to define a stop position that allows the two frames to be assembled and affixed using the mechanism of connection.