I'm now on to versions 21 and 22 of 'adjustable' spreaders. Well, these
two are not so much adjustable as variable. The idea is that I can change the
spreader arms as required while the boat is rigged. The arm holders are
clamped to the mast using a long machine screw. In version 21, the machine
screw screws into one of the milled and turned black Delrin holders. The
arms are a close friction fit into the holders here. In version 22, the long
through-mast screw screws into the end of one of the spreader arms. The other arm is pinned
by a separate screw as shown. The arms are not quite such a friction fit
therefore, and the Delrin holder can be shorter.
The exploded detail:
Version 21 detail
Version 22 detail
The shrouds are clamped to the end of each spreader
arm. A shallow groove is milled so that the shroud, when clamped by the
machine screw, doesn't get excessively compressed.
Spreader arm detail