10690 Set Square for Calibration 325mm

Recalibrate your underpinner for the best join

Underpinners can become misaligned over time, so you don't get the best join. This set square helps you recalibrate the back fences to fix that, ensuring all v nail firing positions are along the centre of the join.

- Extra-large 325mm clear acrylic set square with engraved centre line.

- Use to ensure all v nail firing positions are along the centre line of the corner join.

- Can also be used to calibrate mountcutters and any other machine that relies on a 45 or 90 degree angle.  

- To use, loosen the fences then place the set square on the underpinner.

- Move the nail head backwards, checking and adjusting the set square until the nail head follows the engraved line.

- When you're happy with the alignment, you can retighten the fences. Click on our video above to see these steps in detail.