The edge is now free and can readily be whetted.
When the cap needs to be entirely removed, for instance, for grinding, after it has been slid along the cutter slot, as before, it is turned at right angles to the cutter, and then slid down the slot until the cap-screw unbuttons from the cutter.

The object in sliding the cap up the slot before turning it, is to prevent the danger of injuring the edge.

Some caps are now made with the buttonhole at the upper end of the slot.
After sharpening, (see under sharpening, p.

117.) the order is reversed for replacing the cutter.

The cap is set at right angles to the cutter, the cap-screw dropped into the slot, the cap is slid up the slot, and turned into line with the cutter, and then slid down the slot till the edge of the cap comes quite near the edge of the cutter.
Then the two are held firmly together with the left hand until the cap screw is turned tight.
In replacing the cutter and cap in the plane, care should be taken not to injure the edge and to see that the Y adjustment lever fits into the little slot in the cap; then finally the lever is thrown down tight.