The only way I got a 401A chaining was to use the bobbin case and throat plate from the 411G. I don't think it can be done without fabbing up parts. I sold the 401As that came through the house and kept 1 431G and one 411G and a 503J.
TF can't be that toxic. I found one of the cats licking a machine that I'd just oiled.
She's still here. I close the door now to the ,.. Ah,.. I'll just call it what it is... sewing shop.
ETA: Plume... it looks GREAT!! I think that guide is the least important one on the machine. As long as the thread doesn't catch and shred on that spot, you -may- need a little tighter tension. When I get home tonight.... or maybe tomorrow, I'll see if I can find you a part number and if it's still available. You're looking for the needle clamp.