In replacing the HO spring purchased from Sarco, I found the spring to be WAY too thick...I had to reduce the thickness by polishing it down a lot with a Dremel and a rubberized polish wheel...I do know that it does not need to be that strong...Just enough to drop the HO down when you pull up on the toggle...The stronger it is the more the mag spring has to push it up anyway...
Hope this helps...
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