Kundo 400 day anniversary clock
1 Video View·Apr 26, 2026
This Kundo 400-day clock was purchased with a broken suspension spring. Torsion clocks such as this require a thin band of steel called a suspension spring. As power is released from the escape wheel the weights twist in both directions to produce the beat. They can be tricky to regulate but in this case, only a very minor adjustment is required to obtain a perfect beat.
This is a Kundo 400 day anniversary clock. It came to me with a broken suspension spring.
I consulted my Horlovar manual and determined that it was a model 1371
requiring a suspension spring of 0.081 millimeters or 32 thousandths of an inch.
And so the old spring was replaced and using a template on the Horlovar manual
I was able to line up the blocks and the fork successfully and usually what happens is once
you've got it everything in place there is some fiddling involved and that requires a
bead adjustment and the bead adjustment is right here so it means turning this
top fork however it seems to be and seems to be in beat I haven't checked the
the beat carefully but it sounds like it's in beat at this point.
So we have a essentially broken Kundo 400 day anniversary clock and broken by mean
meaning a broken suspension spring which is very common of course and this is the repair
probably about 10 hours work. Some folks have really bad luck with these things but I have
several 400 day clocks and for the most part I've been fairly lucky getting them to run
and that is a beat amplifier in the background and I'm noticing fairly good over swing.