When a stop block is clamped by a single T-bolt, it has a tendency to rotate. An anti-rotation strip can be added. This is a small piece that fits snugly into the T-slot. Make this from a strip of wood that is the exact width of the narrow part of the slot, and is no thicker that the shoulders of the T-slot. This stop block incorporates an anti-rotation strip.
FS Guide Rail T-Square - latest creation Been fiddling with my latest gadget, a heavy duty t-square attachment for a FS guide rail. It's made of 1/4" 6061 aluminum, cut on a water jet (I think) and the 90 degree leg is 450mm (~16"). It should have the same level of accuracy as the large (450/600MM) woodpecker's square.
Accutrax™ Pencil Blades - Made of a graphite composite formed into the shape of standard two-notch utility blades, these leads convert a utility knife into a precision marking pencil. Ideal for scribing lines on lumber or drywall, the 1/32" thick blades make a thin, consistent line and never need sharpening.