Originally Posted by sewingpup

The 34D foot is the same foot as the 1D and is also the same as the 1C. The 1D doesn't have the side slit for the thread but can be used with the dual feed. The 1C does have the slit in the side for the thread pull but can't be used with the dual feed. Both the 1 C & D feet are metal. When I use the 34D feet, I will use a leader ender so I don't have to continually pull the thread throught the foot. I don't think I would try and make a slit in the plastic foot as that would likely weaken it?