I've got an old Singer 241-13 which I use only infrequently. It's a clutch operated motor and very high speed making it hard to control for an amateur like me who doesn't spend hours in front of it. Been sewing the last few days and decided it needed some modifications. Did this guy's two mods. What a difference. About half the speed and twice the distance for your foot to move in controlling the clutch. Much more user friendly. If you've got an industrial sewing machine and don't have the skills of the full time industrial seamster, these changes are great.

https://www.youtube.com/watch?v=jaVDiZGi9js

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13