I just discovered I Have a Hamilton Beach Model K Mixer, are there replacement parts available?

My Wife just inherited, thru her mother, a vintage Model K Hamilton Beach Mixer, Chrome, and in excellent shape, amazing considering it is at least 50 years old. It is runnin rather slowly, and I checked, and noticed that the brushes are not totally worn, but almost there, and since there are two sets, I would like to replace them, and was also wondering if anybody knew the ratings of the resistors on the plate for the Speed control. I would like to replace these with modern ones, as the older ones are prone to failure and tons of heat. I would also like to see if there are available, the several addons, like Juicer, meat grinder, etc. Any Help is extremely appreciated. Thanks!!!

Answers below in Comments Section