https://www.heydownloads.com/product/howard-rotavator-hr12-parts-manual-pdf-download/
http://www.guymachinery.com/historical-rotavators.html
Found these on google, hope it helps.
Well, I took the plunge! Unit does have the hydraulic thumb and 3rd function, I have no need for rear remotes right now. It should be here next week. BTW, dealer had a ton of equipment on site, good to see.
I have one called "Assassin", Amazon if I remember. However, I think a laser actually mounted on a gun would be way more effective. Non lethal route, consider a super bright flashlight.