I wish I could tell you exactly how the belts are replaced on a Kenmore 158.1941.I had the same Kenmore model,I never had to replace a belt on that model.I still have 3 boxes with Kenmore 158.1941 sewing machine accessories,cams,monogrammer and more. I loaned the machine to someone I thought was a very reliable person.Not !
[edit on Wikidata] The peak expiratory flow (PEF), also called peak expiratory flow rate (PEFR) is a person's maximum speed of expiration, as measured with a peak flow meter, a small, hand-held device used to monitor a person's ability to breathe out air.
Ejection fraction (EF) is the fraction of outbound blood pumped from the heart with each heartbeat. It is commonly measured by echocardiogram and serves as a general measure of a person's cardiac function. Ejection fraction is typically low in patients with Systolic congestive heart failure. Ejection fraction is a similar but distinct mathematical model when compared to stroke volume, which (along with heart rate) determines cardiac output, which is the amount of blood the heart pumps per minute. Mathematical models of Volume vs. Time are well documented in the encyclopedia.