If your cord is long, you could cut it and place a waterproof switch box in line. Some only use a standard single throw switch and the actual switch cover has a large on off toggle that is easy to handle. Only one wire (the hot ) will need to go on a single pole switch, the hot and ground will go on a double pole single throw switch. The safety groung needs to be fastened to the safty groung screw on the switch. The only hard part is to mark each wire the same when cut apart and having someone sighted make note of which wire is which before cutting. The insulation on the cable would have to be carefully removed. Than each wire , one at a time needs to be cut and marked. Both ends of the hot will be marked the same, say no insulation is removed. One quarter inch of insulation could be removed from the ground wire and maybe three quarters of an inch on the safety ground if insulated. I have done small nicks in the insulation already. It really would not be bad at all to do it. I might add, that the large toggle throw switches on the waterproof covers do work very nice...........bob
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