This is my mitre sled with a fence that is adjustable and easy to bring into square and another feature is that it has a double base which allows me to tilt the blade to any desired angle and slide the upper sliding base against the blade and form a zero clearence setup.The sliding upper base panels slide in rebates of the front and back fence and are locked in position by thumb screws .(red in last pic )
The fence is bolted to the bottom base by four bolts and T nuts with the three holes to the right being larger the the bolt and the left hole being tight and serving as a fulcrum .
The alignment is accomplished by turning the adjustment device (last pic )and bringing the fence into square and tightening the bolts .
The fence also has replaceable inserts to accommodate different angles and blade width that are housed in a dovetailed recess with leveling screws .