No doubt Silvertramp and dieselcrawler... That could really hurt. Perhaps try one of these for just smooth ground operation, and then fold it in for the rough stuff? I almost lost my thumbs a few times while running old water trucks up and down really rough pipeline spreads up north while a teenager. You can train the new guys by taping their thumbs to their index fingers. Kinda weird, but it works.
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Ed of all trades - I hear you on how easy the hydro steering us. I agree. I also think you'd be surprised how you might not be able to live without a spinner on a hydro steering machine. It really is the best application for them and just makes everything better. Super finite control, no guessing where to put your hand, way less effort, etc... You can always use your heel of palm still, but I doubt that happens much once the spinner is on. Not criticizing your valid current method, but wanting to share a way to make your whole world better! These honestly should be standard equipment in my opinion. Good luck!