Hollow-spring peg-calk,
No. 12.
Fig. 169.
Peg-puller.
The calks may be removed by an extractor ([Fig. 169]) having at one end a thread which is screwed into a corresponding thread on the inside of the hollow calk, when by a few hammer blows on the shoe the calk loosens. To prevent the calk becoming choked with dirt, a piece of cork is thrust into the hollow. It may be easily removed by means of the corkscrew at the other end of the extractor.
5. Shoeing with Peg Toe-Calks.—These are an invention of considerable worth, especially for heavy draft in hilly country. They render better service on hind than on front shoes.
Peg toe-calks with a single tap are simpler and preferable to those with two taps. Every known contrivance to prevent the occasional loss of the peg toe-calk is impractical.
The shoe for a peg toe-calk should be of good tough material and without a flaw. The toe of the shoe should be about one-twelfth to one-tenth of an inch thicker than the branches.
The hole for the peg toe-calk, whatsoever its shape may be, must be smooth and uniform, with clean, true corners. Semi-circular holes should present the convex side towards the toe.