I was a bit shocked to see M. Lindley's scathing review. My experience with this Emerson guide and stop block has been more than satisfactory. Contrary to what he thought, I found the block to mesh tightly and the micro-adjust screw to be held very well by friction alone. For heavy-duty applications you can always add a lock nut for added security, but until now this has not been necessary. Free shipping. I'm glad I did! While I'm not usually a fan of plastic devices, this one works well. I'veโฆ