Advice on a Project

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I'm looking to get a little bit more down pressure on the feed wheel of my brush chipper.I tryed this spring (from another chipper) just rigged up but it doesn't have enough pressure that I'm looking for.What ever I decide it's going to be mounted in the fashion I have it set up currently.I had thought some sort of shock, and stumbled across the "Fox Shock".  http://www.polyperformance.com/shop/...ock-p-102.htmlNot sure how that would work.Just welcome to ideas/ Attached Images
Reply:i bet the pressure is light so you have a small chance of pulling your body out if you get caught in the infeed.dave
Reply:No, not quite.Down pressure if for crushing limbs and limiting trimming before processing the limb.  If you have experience with these machines you'd know.  Different styles of chippers use different mechanism's.  Like the brand I got the spring from, they use springs, sometimes up to 4 depending on the size.When the knives start to lose their ideal edge (sometimes mid day, not something I can control), this style of drum chippers wants to continue to pull the wood in even though the feed wheel has stopped (to let engine RPM rise) (called "auto feed").FYI, if your that far into the machine, your **** outta luck anyways.
Reply:Can you add some weight to the arm? I suspect 5 or 10 pounds or so might do it.I looked at the fox shock but I suspect it's designed for compression not pull.Look at some standard cylinders:http://www.mcmaster.com/#standard-air-cylinders/=94gvywThey have some information about force @ psi which might help you decide on the bore and stroke you need.