However, if you decide to go this route, you will find that there aren't very many options when it comes to high shank feet that will fit the profile of the extra wide 6mm feed dogs as most high shank feet are designed for straight stitch models with narrow presser feet. Oiling ports can be found all over and are marked clearly in red. Unlike domestics, industrials like to be oiled often as they are running at much higher speeds. There's basically one long horizontal shaft that drives the needle bar with a Pitman arm to regulate the zigzag pendulum swing. All of the adjustments are easily accessible. This is largely due to its streamlined internals. I've installed this in my other table that has a servo motor and find it comparable in volume to a domestic and in some instances quieter. The 138 is super smooth and outside of the constant hum of the clutch motor, is relatively quiet. As it is, the chain sometimes gets tangled up with the knee lift mechanism-especially when tilting the machine back. If you do decide to install a chain pedal reverse, you might consider removing the oil pan altogether or perhaps cut a larger opening for the chain to come through. I've configured my rig such that the motor is controlled by my left foot, while my right operates the reverse and knee lifter. While it takes a little bit of coordination, foot activated reverse sewing is a real time saver and frees up both hands to control the fabric.
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