Springs for Pilates Reformer

I purchased a Faittd reformer that came with two yellow, two green and one red. Needing more resistance, I replaced the two yellows with one red and one green so that I have three greens and two reds. This works perfectly for me. One recommendation that I have is to include a wrench to change the springs and/or include this size wrench in the tool pack that comes with the reformer.

I bought this reformer in October and it’s for my studio. My clients LOVE these workouts. Because it’s getting a great deal of usage I purchased an additional set of springs. I was told studio used reformer springs last 3-5 years depending on how much it’s being used. I plan on training my clients for years and prepared myself when the springs need to be changed.Thank you for this awesome addition to my studio!!!!!