I have a 41 and a 44. The 44 has a phosphorus based, aluminum looking frame. As you know these models love to shed their lovely wrinkle paint in sheets. I have seen several "moulting" machines. The 44 was the worst and I had to sand it down to remove the loose places. I then primed the naked places with an aluminum primer, spray can, and it was white. It takes a lot of masking to keep it off the brownish, or black painted areas. Then, having no supply of wrinkle paint in my area, used Rustoleum, toolbox type finish. It blended very well and made the machine look great. It will be fine for my needs, but perhaps not for everyone. The paint feathered very well and I couldn't be happier. Now I just would like to find it a new home. It is sewing fine too. The model 41 will probably be a parts donor. The rubber drive wheels can be obtained from Sew-Classic.com in case some of you need them. These machines are like the Energizer bunny and Timex watches, they are practically unstoppable.