6.30: mis.gear/exercycle/chair`stem`weld failed:
. the Marcy exercycle's seat weld failed!
and, inspecting the weld area,
the reason is obvious:
they had the weld strengths reversed:
they needed only light tacks
in the back,
but a good strong seam in the front
because that is getting
a lot of lift pressure;
instead there were only
2 tack welds in the front,
so when the front tacks snapped apart,
then the seat pitched backwards about half a foot .
recovery from chair`stem`weld failure:
. repair should be a further modification
so that the cycling device can be mixed
with your choice of seat .
. I'm replacing the broken seat with an office chair .
. this version of the exercycle was quite modular,
so, the piece that was in the way
was easily removable .
. the office chair's central post
comes down an inch farther than the legs
so it was placed to one side of the boom
(the body that connects the 2 pairs of legs,
a pair of T-shapes connected into an I-shape ).
. the boom is too high,
and the chair won't remain flat on the floor?
maybe I can lower the boom by removing the rear legs?
but from the middle of the boom,
there's a knob extending an inch to the ground
(not removable, the weld is likely excellent ...);
so, while the chair's legs could be on the floor,
the front legs were dangling in the air?
use the pair of 2x4's to support the raised front legs .