Crank Arm Toast?

After nearly a year riding them, my Nervar Star left crank arm came loose about 2 months ago while I was riding. I put the bike on the train and walked it home from the stop. I tightened back up, this time with lock-tite on the bolt. It seemed ok for awhile, but a few weeks ago this clicking started when I was pedalling hard. I checked and the bolts were still tight. It got much worse this week so I decided to take it to the bike shop downtown by my office to see if they wanted to take a look at it. After being treated badly by the staff and with lots of "French stuff, ooooh, yeah that could take awhile" comments, I left in disgust. I tore the arm off last night and figured out that it is not deformed in the normal way that an arm deforms when it comes loose (rounding it out), rather the flat sides have been dug into too much by the spindle at the point, so it rocks impercetibly on the spindle while riding. But you can sure hear it. I'm now looking for a solution or a new crank arm. What a bummer. These are really pretty cranks so I hope I can fix it.