wide fig1 shows a roller of a roller frame a channel 121 is of a prescribed length width depth and location on the roller frame so as to receive the border strip of fig8 fastener features 122 align with the fastener features 83 of fig8 the thickness 82 of the border strip of fig8 is exactly calculated to provide for insertion into the channel 121 of fig1 fig1 shows a cross section of a roller with a channel 131 that has a flange 132 constructed into the inner wall of the channel the thickness 92 of the border strip of fig9 is such as to provide for the insertion of said border strip into the channel 131 of fig1 the cupped edge 94 of said border strip is such as to cup over said flange of said roller fig1 shows a roller frame corner member and roller end plug the corner member 115 has a bore 112 with surrounding housing 114 through which a pin 111 can be inserted said pin upon being inserted through said bore is inserted into recesses 113a 113b 113c 113d and 113e of the roller end plug 116 the said end plug recesses serve as aligning features of the roller frame recess 113a is an alignment feature for the start position in stretching a fabric since the roller frame construction consists of four rollers each connected by a corner member all four rollers can be locked down by the locking features of the roller frame into start positions as determined by the location of the.