2014 sportsman, starter solenoid

Hi, this is my 1st post on here. I want to say, reading ya’lls post have helped me a lot in the past ! Thank you ! Ok, I have ordered 2 aftermarket solenoids for my 2014 sportsman 400ho . At 1st it wouldn’t ground well. I fixed that, but the wires came loose just a little and I’m having same problem now. The post are so small, I tried taking the 2nd nut off and it caused the stud to move and ruined another solenoid. Is there anywhere you can get one with bigger studs. Or maybe use a different kind. It is a very touchy solenoid. Thx again.