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Above posts are correct: one way to fix clamp that will not lock, is to adjust the screws under the glide pads on front/inside edge of the fence. This pushes the fence forward, and reduces the gap where you clamp.
This assumes your glide pads are not missing, or worn down to nothing?

The clue that points to glide pad adjustments needed, is location of clamp in 1st picture?
It should clamp before it reaches the end of circle like shown LeeRoyMan last photoin pst #2.
The difference is very subtle, but then so is difference between clamp and loose. ;-0)

BTW - For two Biesemeyer fences I bought used to upgrade old rebuilt Unisaw, they also had significant wear on the concentric (offset round) end of lock shaft. The wear was enough that even with new pads, and fully extend adjustment screws, still would not lock tight.
Read a solution somewhere, and tried it successfully:
Added couple beads of weld material to contact portion of concentric clamp. Then I used a file to level it off, and adjust the fit. Since I have equipment, this was cheaper than buying a new part. The weld metal is harder than normal soft steel, and creates a 'hard-face' surface. This same type of hard-face repair is often used on irreplaceable worn out shaft bearings. Simply add metal, and then machine it to right size.

The newest versions of the fence clamp swing arm use a replaceable pad of laminate on face to increase friction. Picture thanks to ebay seller that carries them.

Can get free sample of kitchen laminate from BORG (any color works), cut it size, and use contact cement to attach it. This is another way to move the clamp ~0.100 closer to the front rail if growing the size of concentric is not within reach.
Biesemeyer used same kitchen laminate as glide material in other locations in early version fences. When Delta bought Biesemeyer they changed to nylon pads like shown in LeeRoyMan photo in post #4. Delta spare parts can be challenge to find, and old timers would resort to bonding laminate with epoxy as replacements.

One caution. The goal with clamp is to stop fence movement, NOT lock the clamp bar all the way down. You can apply too much clamp force, and dent the front rail. DAMHIK #IAMAKLUTZ

Best Luck!
 
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