I recently replaced the crossover in my Minimus 7s. I considered the kit that Sfar refers to (sold on ebay), I also searched Audio Asylum where there's lots of advice. In the end I simply built a 1st order crossover from parts I purchased at Parts Express. I also replaced the sprung wire connectors with good 5 way binding posts. I used acrylic from Home depot for the structural parts (ie to fasten the caps, inductors, and binding posts to). The only challenge was positioning the cap so it wouldn't interfere with the woofer.
This is an easy DIY project, even if you haven't done anything like it previously figuring it out yourself is a good learning experience.
This is an easy DIY project, even if you haven't done anything like it previously figuring it out yourself is a good learning experience.