Hi Steve and grumpy, I just checked the Illustrated Parts List for the 20" Model 45, and part number 47, "Drum Weight" and part number 48 "Drum weight screws (2 off) are clearly shown as being located on the engine side of the machine....So Steve's machine is assembled correctly.
Just a thought, the reason may be to offset the weight of the third segment used on the 20" machine whereas the 17" Model 45 has only 2 segments in the rear roller. wink
The plot thickens!! grin
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin