I have recently purchased a Mantis Tiller Cultivator (2 Stroke),4hp, 2ND had but in very good condition it has only been used about 6 times the seller says,and it looks like it too,only a small stone chip on the guard,for use on my garden,to prepare the soil for winter crops,I have never used one of these Tillers,Has anyone used one of these and if so what is the best way to use them,although i have read and heard that they are very useful.My soil is not to bad on the surface,but a lot of clay about 3 inch deep,I'm thinking of maybe putting some sand and compost on it then turn it in with the Tiller.Any advice would be most welcome,many thanks in anticipation of you re replies.