[Philip Messer]

I have concentric springs (one larger diameter spring on the outside with a smaller diameter spring on the inside). The springs would occasionally entertwine--in other words, when the springs were elongated the inner spring would become entangled in the outer spring and when compressed, the springs would not retract fully to their neutral position. So, I inserted a copper pipe between the springs. The smaller daimeter spring was inside the 4-inch long pipe and the bigger spring was outside the copper pipe. WALA--no more problem!