Medicare allows for mask cushion replacement every three (3) months, and a complete mask system replacement every six (6) months. CPAP manufacturers and vendors suggest these replacement schedules as well. In our experience, most mask cushions begin to deteriorate after about six months of use.
Hereâs what you do: 1  Figure out the length that you want your finished sleeve to be. On the outside of the shirt, mark that spot with a line. 2  Using a see-through ruler or regular ruler, mark a line 1 Â½â underneath the first line. Use the ruler to continue that line across the sleeve. 3  Repeat on the other sleeve.  Cut on the second line you drew.
Press the seam open, then press the seam towards the sleeve (away from the body). Zigzag the sleeve and armhole seams together to finish the seam. 3. Matching up the underarm seams, pin and sew the side seams and the sleeve seams together. Start sewing from the side seam, then sew down the sleeve seam.