I have had two york vices. Both within a span of two years quit closing on thinner stock. The guild rails bent with use. They needed more and more tightening to grip. And lost their taper to the jaws.
I also have two eclipse vises and the older one is considerable better quality than is the newer one. With the same jaw material, and being the same size vise the older one holds considerably better.
I would hunt down and older 40-50s vise
To replace the newer eclipse.