I have been using the EMS Heavy Duty DSC Switch from TH for $11.99 for some years. The last few that I have bought are really tight (circled in red) when trying to put the pig tail in or pull it out from my charger or battery tester. So tight that when reaching inside the fuse to unplug it I can't pull it out without grabbing the wire and I pulled the wire out of one. The EMS is about the same as the MPI and the JR switch. I'm looking to buy some other brand. What are you using and where do you get them?