the sprocket I have left on is directly connected to the drum though it is chain driven from a twin gear reduction where you see the hole on the second picture at the top, this also has a hand leavered clutch as part of the assembly to get the drive gear initialised, i will put some of the pieces back in place and get some pics but you can see the large clutch sprocket in the first picture. this does seem to be a bit of a frankenmower and I was going to put it back together and just get it running and sell it but I've now become attached to its character.... I have texted the SA seller of the one pictured above maybe they can be a top bloke and send me some info, i would buy that thing if only i didnt have to travel 2500km