Hi Grumpy there is a recess on the counter ballance above the disc and the disc sits into it also I don't see why the counterballance should have a big nut holding that on as it's threaded as well that's why I am questioning the disc washer just thought you would like to know I will do some more checking around sadly the mower mechs up here to say the least are a bit mower challenged when it comes to rideon's even though about every 3rd house has one. thanks again Grumpy for all your help.
Ed
