shoe on my jigsaw is wobbly and won't stay square, how do i lock it down?

Diagnosis

The wobble in the DCS334B shoe is typically caused by a failure in the friction-lock mechanism located at the pivot point. On this specific model, the shoe is designed to tilt for bevel cuts, but if the knurled locking lever is not seated properly against the pivot pin, the shoe will "drift" or vibrate during use, causing the cut to go off-square. This is often exacerbated by sawdust buildup inside the pivot hinge, which prevents the locking plate from making full flush contact with the shoe base. To confirm the root cause, unplug the tool and attempt to move the shoe manually. If the shoe moves freely even when the lever is tightened, the internal tension spring or the plastic threads on the locking knob have likely stripped. If the shoe feels tight but "clicks" or jumps when pressure is applied during a cut, you are dealing with a misalignment of the pivot pin or a worn-out friction washer.

How to Fix It

To lock the shoe down and ensure a perfectly square 90-degree cut, follow these precise steps:

1. Remove the battery to ensure the tool cannot accidentally trigger during adjustment.
2. Locate the knurled plastic locking lever on the right-hand side of the base shoe. Rotate it counter-clockwise to fully release the tension.
3. Using a machinist square or a reliable 90-degree reference block, align the edge of the shoe perfectly perpendicular to the base of the tool.
4. Check the etched degree scale on the side of the casting; ensure the indicator is aligned exactly with the 0° mark.
5. While holding the shoe firmly against your square, rotate the knurled lever clockwise. Do not just "snug" it; apply firm hand pressure until the lever bottoms out against the pivot housing.
6. Apply downward pressure to the front of the shoe to verify there is zero lateral or vertical play. If it still wobbles, loosen the lever, shift the shoe slightly to clear any debris, and re-tighten.

If That Didn't Work

• Deep Clean the Pivot Point: Use a can of compressed air or a stiff nylon brush to clear the gap between the shoe and the tool body. Small chips of wood or accumulated sawdust often get trapped in the pivot hinge, acting as a shim that prevents the locking lever from clamping the shoe fully.
• Inspect for Thread Stripping: Remove the knurled knob entirely. Inspect the internal plastic threads. If the threads are smoothed over or "stripped," the knob will spin without applying pressure. In this case, you must replace the knob assembly (Part #DCS334-Shoe-Kit) as the plastic cannot be reliably repaired with adhesives.
• Check for Bent Pivot Pin: If the tool was dropped or used as a hammer, the steel pivot pin may be slightly bent. With the knob removed, try to wiggle the shoe side-to-side. If there is a gap on one side of the pin, the shoe will never lock square. You will need to remove the shoe assembly and gently straighten the pin with a vice and a rubber mallet.
• Apply Friction Paste: If the lever is tight but the shoe still slips, apply a tiny amount of high-friction resin or a thin rubber washer between the locking knob and the shoe. This increases the grip on the pivot plate and prevents the shoe from rotating under the vibration of the motor.

Heads Up

• Avoid using pliers to over-tighten the plastic knurled knob; the plastic threads will shear off instantly if you apply mechanical torque beyond hand-tightening.
• Always verify the shoe's squareness after every few cuts, as the high-frequency vibration of the 20V Max motor can occasionally loosen the friction lock over time.
• Keep the shoe surface clean of pitch and resin; a sticky shoe will "grab" the workpiece and pull the tool out of alignment, making the shoe feel wobbly even when it is locked.
• Periodically check the blade clamp for debris; if the blade is not seated perfectly, the resulting vibration will shake the shoe loose much faster than normal.