I connect and disconnect mine frequently too as I use my 740 in an AirGizmo Dock. Though I've not had any issues with my 700, 720 or 740. I try to pinch close to the base, twist and pull straight out, using the case as a leverage point. As with any of these MCX connectors, you don't want to rock the plug side to side. Use a pinch, twist and pull motion and you should have no issues. However, if you wanted to put a pigtail on your 740, I've put a link to an item in eBay. You might also check at www.digikey.com, they have lots of connectors.
Buy on eBay here>