10. Count down 14 ripstop boxes from any corner of  the 7-inch square piece and make a start mark.  [Figure 7-17] •  Description: Application of a basic canopy patch •  Authorized repairmen: FAA Senior or Master  Parachute Rigger  •  Materials: E thread—color to match; fabric—type and  color to match •  Machines: 301 straight stitch—light duty 7–11 SPI •  Equipment: Canopy or material to be repaired,  marking pencil, single-needle sewing machine with  E thread, ruler, hemostat, scissors, and nippers 11. Place the 2 start marks on top of each other using the  hemostat to hold the 4 block seam allowance in place  and sink the needle. Always sew counter clockwise  around patches so that the bulk of the parachute  does not have to go through the bed of the machine.  [Figure 7-18] 1.  Be sure you have found all the damage. 2.  Mark the boundaries of the damage. 3.  Allow 2 inches for repair and fudge factor from  each boundary. 4.  A 6-inch patch will cover approximately 2 square  inches of damage. A 7-inch square piece of fabric  will be needed to make a 6-inch patch, using  1 ⁄2 -inch  seam allowance. Always put the patch on the inside  of the parachute. Figure 7-17.  Start point.  Procedure Figure 7-18.  Start patch to damage. Figure 7-16.  Patch layout. 5.  Find the center of the damage on the 13 1 ⁄2 -inch  square piece. 6.  Measure half the patch size or 3 inches out to the left  of the center of damage following one ripstop line in  the fabric. 7.  Make a center mark and a left border mark (this will  look like a T laying on its side). 8.  Measure half the patch size or 3 inches up the left  border ripstop line from the center line and mark the  top border and left border (this will look like an upside  down L).  [Figure 7-16] 12. Count up 4 blocks from the bottom edge of the patch  and use the hemostat to form a corner, line up the  ripstop boxes, and load each piece with the same  pressure. Then, sew to the corner.  [Figure 7-19] 13. Repeat this step until the first two corners are sewn  down. At this point, check the last corner to assure  that it will fall in the top and left border marks (upside  down L) were made when you the measurement step  was completed. Then, sew the last two corners down.  [Figure 7-20] 14. While sewing, it is important to pull the fabric at  the same speed the machine is going and to set the  hook in the stitch loop before lifting the foot to turn  a corner. Always make a four to six-inch oversew.  [Figure 7-21] 9.  Count down 10 ripstop boxes from the top border and  make a mark. This is the start mark. 7-18