sewbizgirl

At an estate sale I saw a pretty plain cabinet that I recognized should have a sewing machine in it. Was shocked to find a black shortbed 301 in it, in nice condition! This is the one machine missing from my collection-- never even saw one in person before! It had the little bench seat too.

Now that I have it at home I am starting to play with it. It sews well but needs that good first cleaning/oiling/greasing. It's been years since I did this... I know Liquid Wrench is a good cleaner, but remind me if Tri Flow is okay in lieu of oil, and Tri Flow Lubricant in lieu of grease?

Also, from the serial number I found this machine is a 1952 model 301-- no "a". What exactly is the difference between a 301 and a 301a? Or did they just start labeling them with the "a" after 1952?

Thanks for your help and advice!