Fence will not lock in place
You adjust the handle tension by actually adjusting the t-square itself, changing the relative position it sits from the rect tube mounted to the saw.
This is done by turning the two allen set screws mounted in the angle iron that is welded to the fence. There are a couple of tabs that ride along the inside face of the rect tube when the fence slides from side to side. You'll see that each of these tabs is adjustable, in or out, by slightly turning the allen set screws with an allen wrench. BOTH of these must be adjusted, so that you maintain the fence's 'squareness' to the table.
What I do is line up the edge of the fence with the mitre slot in the saw table, feeling the edge of the fence as it hangs over the edge of the mitre slot, both at the infeed and outfeed end of the slot. It should be perfectly flush at both ends.
By turning the set screws in or out a little, you can adjust the handle tension to the place where you like it (you don't need to force it into position to have it hold firmly; that's too tight). Then check the squareness of the fence by clamping it down along the edge of the mitre jig slot, and see if it's parrallel. If not, you need to adjust one or both screws to make it parrallel, and get the tension right. You may have to go back and forth a few times, but eventually you can dial it in to where it feels just right and the alignment is correct. Think small adjustments.
At the same time, put a little dab of wheel bearing grease or vaseline on the cam of the fence handle where it rubs against that little flap. This will make it easier to engage when the tension is firm and keep it from wearing abrasively.
This fence is a joy to use when it's dialed in. I hope you find this information helpful. Happy woodworking! Read More At : BC50 Left Handed Biesemeyer Commercial Table Saw Fence......