I only use a foot pedal anymore. I haven't used a knee pedal in more than 50 years. Someone here mentioned to us here a product that I jumped on to purchase in early 2020. I couldn't wait to get it and it works! My foot pedal has hardly moved in more than a year! The item is "
Martelli No Slip Pad for for Machine Foot Pedal". The link is,
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I love it right now it is $12.69 with prime. The sight says they have 15 left right now. I find it to work better than anything I have ever tried to grip my pedal to the floor.