Over the past few months, I slammed my fist (a few x's) on the lockdown bar of one of the most challenging machines on the planet ~ TWD. The other day I noticed an insert light that was flickering & I needed to investigate. When attempting to free the lockdown bar, I had some trouble getting the bar free. Though all is well now, I will for now on take out my frustrations on my twenty five piece drum set > instead of my machines.