Heels for Apollo Fins
of the clips after I modified it, and one before. I removed
round cylinder that the old rubber strap made a 180 around,
two rectangular bits that sick out from the side, a little bit of
the main structure so the nylon spaces would have a flat place to sit,
and a bit of a ridge on the back of the flat button part.. I
a small milling machine, but it could all be done with hand
tools. The cylinder just pops out.
I was fortunate to have a collection of clips from old broken straps.
Note the piece of "cave line" running down the middle of the spring. This is to keep you from over stretching the spring when you take the fins on and off. Make it long enough to get the fins on and off, but not much more. McMaster-Carr specs the springs to stretch 7.40", so 18.40" (= 11"OA + 7.40") should be the max length of the cave line.
a picture showing how the cotter pin is installed. Note that
cotter pin sits down nice and flat on the washer under
That's because I took an extra plastic spacer (that's why there are NINE
in the parts list) and put it over the end of the clevis pin and
squeezed it all in a vice.
picture showing an unmodified (therefore too long) clevis pin, spacers,
washers, and unmodified (therefore too long) cotter pin. It
the sequence of assembly. Modifying the clevis pins was a
pain. I wish I'd checked McMaster-Carr first.
a picture of the strap installed on the fin. Note that the
upside down in this picture. Also note that the cotter pin
the buckle is down when the fin is on. This is because
lots of space at that end.