The up and down movement you are talking about leads me to think I am right about this... it pretty much confirms what I was thinking... so hang in there and I think we can solve this...
The pic above is not what I am talking about. The safety bar has a set screw that runs thru it and acts as an adjustment for that up and down play. Almost like the fulcrum of a teeter-totter. Only older models had it, not the new designs that use that spring that you are pointing to.
I can't figure out how to post pics... Send me a PM with your cell or e-mail and I will get you a pic of what I am talking about.
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