Speed control

[Yaker]

My kayak cuts the water at too high rate of speed for spider rigging,My trolling motor is an older model Minkota 5 speed.I stern mounted the motor,but relocated the control head to the left side of my seat.
That said,I can't bring myself to purchasing a new variable speed motor,and cutting its control head off .Has anyone tried or know of anyone who has tried a pulse width modulator ( PWM) to control the motor speeds?

[Clint]

There are a few videos on YouTube describing exactly what you are to do.