pallet

The Old Dragon fled when the wonder he spied, / And cursed his own fruitless endeavor; / While the Painter call'd after his rage to deride, / Shook his pallet and brushes in triumph, and cried, / "I'll paint thee more ugly than ever!"

the swing wheel […]is represented as being locked by one of its teeth on the nib or detent part of the right hand pallet, and the moment when the wheel is unlocked, the tooth at the left hand pallet is ready to press forward and raise up that pallet