Tenshodo Switch machine/Switch issue

It may be that the spring has popped off the machine so it does not hold position after throwing. 

Or worse  case, the crank on the end of the plunger has fractured from fatique.    I have this happen on NJCB machines, but not Tenshodos.

The springs can work loose easily and just need to be reinstalled.

The spring is there and everything works fine until it is attached to the switch from underneath. Then the force of the rail being bent to allow straight travel past it forces the machine back from the end of travel. Do the Tortise machines operate differently than this? (Due to electrical routing thru the switch machine to the rails using a ground throw isn't an option.)

It seems like that straight rail is too stiff.    Did it ever work?  

1.  You could put a hinge in the rail to relieve the force against the switch machine throw bar.

2.   It is possible to use a ground throw.  I get little SPDT spring switches from radio shack.  They are a little box about 1/2 x 3/8 inch by 1/8 inch thick with a spring arm on one long side.   I mount these so the spring arm is against the back side of the ground throw arm.  As the ground throw arm moves, it moves the SPDT switch.  

Also caboose industries makes a ground throw with contacts.   I have not used them, they look pretty light weight to me.