Hi, Not having any experience of using a PTO driven flail, I am pondering which 'duty' build standard - 'standard' duty, 'heavy' duty etc - I should go for. Inclined to play safe and go for heavy duty gear-box and 800 gram hammers (with extra cost of course). Am wondering though how others might have fared using a 'standard' duty flail (with, say, 400g hammers) to clear really rough stuff. By rough stuff, I mean mix of dense bramble, dense bracken, rush and, worst of all, well established grass tussocks which are so old that they have become mini-mounds. Latter will take some chewing up and the box-grader will almost certainly have to be employed for final leveling to avoid wrecking the flail. Not much really woody stuff in the mix as I will deal with any old gorse manually. Any thoughts please?