Remove the end cap. It has 3 legs which are hooked UNDER the inside rim of the outer speed dial ring.
These legs look like a one piece plastic part as if it belongs to the outer ring, but it does not.
The end cap legs can be bent inwards, i.e. away from under the speed ring,
Make sure you have good light, so you can see how the legs move.
With a flat screwdriver (fairly wide) bend back (twist the screwdriver gentle) all three to evaluate how strong they are and get a feel.
That also help loosening them.
I recommend to bend back one at a time and put small shims where the screwdriver goes.
While I was able to do it without, it with shims it will be easier to keep the legs inward.
Once you get two legs to come up from under the ring, you can get the entire end cap out.
Had to do this to fix the tilt mechanism. There was an inner nut that had came off the holding bracket. I suspect vibration made it come off , so I put some nail enamel on it after fixing.
The speed ring screws etc. are all accessible once you have the end cap off.
To get to the actual speed control knob, just unscrew the next little part, you'll see and it becomes obvious how to get at the rest.
SOURCE: Sunbeam Mixmaster Heritage Series Model 2350 speed problem
The speed control on the back is simply a variable resistance potentiometer, the same thing that controls the volume on older amplifiers. The output current to the motor is supplied by the printed circuit board in the bottom of the unit. This allows gradual increases in speed to avoid over-torquing the motor on speedup. Even the poshy-posh-posh mixers do this.
At least it still works. The most common problem is the cheap plastic drive gears that strip out with a mild cookie dough, this jams the beaters together and requires burial-at-dumpster.
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