Paul Matisse's Charlestown Bells, removed from the Charles River Dam in June for repairs, are slated to be put back in place on Sunday, starting at 9 a.m.
The Friends of the Charlestown Bells expect the work to take a few hours - and say people who want to help out but who don't feel mechanically inclined can bring sandwiches.
The bells, which let passersby ring individual, colorful tubes as they walk across the dam, were installed in 2000, but gradually fell into disrepair. With a grant from DCR, volunteers transported the bells to Matisse's Groton studio for repair.
Matisse, grandson of the French painter, is also responsible for the Kendall Band musical installation at the Kendall Square T stop.