FYI on the bright pink Brother 461 Festival.
The feed dogs didn't go back N forth, just up N down. that was the stitch length shaft , which a 15 clone style, easy to remove, took maybe 30/40 minutes, then every thing worked fine.
last night I checked and lude the gears,, which only drive the bobbin. Pfaff style, The gears are metal not plastic they do look like pot metal. which breaks, I found new gears at $24.95.
before tearing into that machine I did the google searching on the feed dog moving thing .. every site I read it ended up being blamed on broken PLASTIC gears. even a OSMG telling a lady to toss it that repair cost would be to high in labor.
HOG wash !!!!!! I bet anyone here could replace those gears in 30 minutes 2 hours at the very most. meaning getting out tools to the final putting everything away.