Originally Posted by
T-Mar
That's what is called a Maxy style spindle. Typically, there is an numeric-alpha designation ( .e. 3F, 3H, 3K, 3S. etc) on the center section. They're quite common and inexpensive.
Is this Maxy style spindle not actually JIS? Did it come out before the JIS standard and that's why the spindle won't work with the modern JIS crankset OP purchased?