volume controls for the boat, tower, & sub?

I have the controls for all three but they cut out. I need better ones and can not find them anywhere. does anyone know where I can find something better than what I have. I would like to keep the same type of knobs in the dash. Thanks

Those look a lot like PAC LC-1's.

Those are as good as it gets.

very doubtful those knobs are your problem

When they cut out I can get them working by wiggling the wire. I have wired them twice now and the same thing they cut out. maybe the switch is bad to the sub it is the one that cuts out the most. thanks for the insight.