b. Darning. Darn a hole or tear in the pack fabric that does not exceed 1 inch in length or diameter using size E
thread and a darning machine. There is no limit to darns that may be applied, provided they do not weaken or reduce the
original strength of the fabric more than 10%. If damage is in the lined portion of the container body and only the cotton
duck is damaged, darn through duck and felt. If felt is also damaged, remove damaged area before darning duck fabric.
Then plug felt as in c.(3) below.
c. Patching. There is no limit to the number of times the container body may be patched. Patch a hole or tear
that exceeds 1 inch in length or diameter following procedures in (1) or (2) below. Use nylon or cotton duck cloth
according to original construction for patching outside, and 1/4 inch thick felt for plugging inside lining. Use an HD
sewing machine, size 3 thread, and 4 to 6 stitches per inch.
(1) To patch a lined portion of the pack (1) when the felt (2) is not damaged, cut nylon or cotton duck patch
(3) 2 inches beyond circumference of damaged portion. Turn under edges of patch 1/2 inch and center patch over
damaged area. Sew patch to container body with a double row of stitching (4) as shown.