This is how I do it:

Prime carb.
Rotate prop backwards till it hits compression.
Attach glow starter.
Place starter on spinner trying to keep it lined up with the crank as best I can.
Using a bit of force, push starter against spinner.
Press starter initiator.
Hopefully engine starts right away.

I have found that fat spinners tend to throw the starter off center more easily than the average spinner.
A softer, more pliable, starter cone may help too.

Since you're using 24V the RPM and torque of the starter may be causing it to jump. Press firmly and good luck.


Jeff