I bought my Teflon foot for very little cost on eBay a few years ago when I was making a lot of handbags, you just have to get one that’s compatible with your machine. I bought a high shank and a low shank for different machines. The tape thing didn’t work so well for me. Have you tried Decovil stabilizer? It’s great especially for bags you need to turn inside out, there’s a lot less wrinkles. Also you can press on the back of vinyl especially with a cloth. Did you use a denim needle? You really can’t use a universal needle for it effectively.