3 speed variable wiper switch

So my 68 cuda had the 3 speed variable switch and motor, but I'm not getting all of the speeds. Low seems to work and then where you would expect a click to medium and fast just isn't there. The variable does work. I know these switches are rarer than hen's teeth so I was wondering if anyone had ever found a more modern switch that could be used in the originals place??? I don't dare try and take the switch apart to see if I can fix the contacts as I'm sure I'd never get it back together again. I thought maybe so long as all I would have to do is maybe drill out the hole a little bigger in the dash and the pot metal backing plate that wouldn't be that hard. Any ideas or anybody ever try this????