For the large shop or manufacturer, the AMBU-Washburn Post Strap Mould,
is made with the special indexing feature of Figure 11. This is easily
adjustable and will cast straps of both odd and even numbers of teeth
for 7 to 19 plate groups. Otherwise its construction and appearance is
the same as Figure 10.
Both of these moulds are made for real use and will turn out three
perfect castings per minute. This unusual speed can be maintained
because the castings are easily removed. In Figure 10, the upper part of
the mould is resting on a part of the handle made for that purpose and a
slight blow on a hardwood stick, on the top of the post, will drop the
casting instantly.
[Illustration: Figure 11[1]]