Guitar Jack Tightener

Personally I'd rather just buy a screwdriver and $13 worth of beer. Do you have alot of jack troubles or something?

Lol how do you tighten an output jack with a screwdriver???

I have a thingy like this, not this exact one but it functions the same way. It sure beats the wires getting twisted up and breaking. The jack always loosens on my strat for some reason so I just keep the tool in my gig bag. Used to just use two adjustable wrenches as the thrifty solution.
 
Some barrel jacks are screwed directly into the body like this one:
Threaded_Endpin_Jack_lg.jpg

I have several guitars with this style of jack. They're very reliable and do not loosen like traditional jacks.
 
It's a good idea, but I think it would only be worth it if you were dealing with jacks a lot. Strat and Tele style jacks are in my opinion the worst at getting loose. I have not had any troubles with my other stuff and can use a socket wrench anyway.