My m12v has started acting up a little lately speed control issue. I am going to give sticks idea a try. Maybe some contact cleaner on the pot. I used CRC contact cleaner https://www.homedepot.com/p/CRC-QD-11-oz-Contact-Cleaner-02130-6/202262505 when I was in the Ham Radio business. I hope I don't have to retire mine she has been a good friend for many many years.