Besides the 301, I also have been working on a Singer 237 I bought that will go into the treadle stand that is not completed refinished. This machine was made in Italy, so now I have the US, Great Britain, and Italy represented in my sewing colony. It was not terribly dirty, but surprising, inside, it had a lot of surface rust. This machine is from the 70s, and all the older machines I have, have never had rust like this one. The casting is a lot rougher than my other Singers. A green scratchie and rubbing alcohol got rid of most of the rust. The needle plate was stuck to the insides with rust, yet the outside of the machine is pristine. I wonder if the quality of the steel was just not as good? I remember Fiats and Alpha Romeos from the 70s and they were a joke of a rustbucket- great interiors, lousy steel. Anyways, I coated all the metal with Tri-flow and hope that will arrest the problem. I am going to disengage the motor for use on a treadle so I can zig zag on a treadle. The belt that was on there was so stiff, that the motor wouldn't turn the machine, so I put on one of those rubber band types to see how it sews. The zig zags looked perfect. I had done a lot of digging out of old gunk in the zig zag gears with wooden sticks and alcohol and regreased with Tri-flow grease, so it paid off. Now, I have the refinish job on the treadle top to contend with and I can't work out in the garage anymore.