I have some old BMI 1.5 coilsprings that I really like. The traps came center swiveled, 4-coiled, with a stake swivel on the end. They have been in the shed for a number of years and I recently got back into trapping so I am going through my gear. The springs are somewhat unique compared to more common brands. I need to replace them and BMI doesn't have any. Any suggestions where I may find some suitable replacements? Thanks in advance.