For this reason you ll only find diamonds on high end tables. The rail should be mounted to the slate in such a way that a seamless bond is created. This allows for solid rebounds and vibration free play. There are many ways to mount the rails, some are better than others. The six most popular ways of mounting rails are lag bolts, threaded inserts, expansion bolts, tie plates, t-nuts, or floating nut plates.
Lag bolts are very coarse threaded bolts used primarily by contractors.
It is a strong bolt that can provide a lifetime bond. However it was never designed for disassembly. After multiple reassemblies the holes will begin to strip out and the bolts holding power will diminish. Threaded inserts are much like a lag bolt on the outside and can pop or slip out after time. When a bolt is tighten against them, the force of the bolt pulls against the insert and the insert pulls against the rail.