The problem is actually two fold for me.
1. The belt gets twisted in the guide for the retractor - happens alla time. I've almost hung myself on multiple occasions when reaching down to pick up something off the floor. So ... make sure the belt stays correct in that guide as much as possible. A stronger retractor would help with this I'm sure.
2. The plastic slider thinggy doesn't stay in place for me either. I fixed this on a previous car by sewing a button where the plastic slider thinggy should be (mine was actually missing). I haven't done this yet on the VX but will eventually.
Rest assured, I have it on good authority that if you are sewing anything in a vehicle you are an upholsterer & not a seamstress (seamster???). Your manhood will remain intact.