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.
An EF is a percentage of blood that is pumped out of the heart during each beat. Ejection fraction is a key indicator of heart health. Physicians assess the extent of heart muscle damage by measuring the left ventricular ejection fraction. Common tests to determine EF include an echocardiogram and nuclear stress test. Cardiac MRI is a new method that is being used more frequently to measure EF as well.