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Personally I would not bend it back. I've no experience with the Grove gear spring. Zenith lists the main gear spring at $506 (http://www.zenithair.com/kit/701/gear.html) and I would spend another $30 and replace all the spacers, bolts, and nuts, so probably about $600 with freight. Easy to replace, four nuts and the entire gear spring and the wheels come off the aircraft. Another four nuts and bolts per side and the wheels are free from the gear spring. I would also inspect the aircraft for evidence of a hard landing, esp. the right side main wheel axle, wing attachment area, and the lift strut attachment area. Installing the replacement gear spring will require some filing, the kit install instructions would help greatly there.
I had called Grove before about a friends Kitfox, They said a while back they changed from using 6061-T6 Aluminum to 2024-T4, They said that they did have some people send back some bent earlier versions and they would analyze it and see if it could be bent back one time with out stress cracks. but they new ones they do not do that anymore and does not recommend it. You can call groves and just question them about their older 6061, it also depends on how much the original hard landing bent it i would imagine. does not take much to see the wing droop on one side by the time you get out that distance at the wing tip. Just use this information for reference only... :)