Agreed with this one, can be effective too. Hope youre able to find something that works for you.I know it might sound a bit mean but grab him and pinch the base of his neck skin near the back about two inches from wings, and pin his naughty behind down he will fight against the notion but do not give into him make sure before you let him up that his tail is lowered towards the ground if released prior then you will have to do it again. Sometimes assisiting in tail lowering is needed to put the point across, but do it to where the flock can see it. It is humiliating him in the grandest order. I've had to do it to roosters who were not to say human aggressive but hen aggressive, after a few pins they behaved and if that didn't work they sure tasted good.