Patent ID: 7254927

Claim:
A method of retrofitting an existing window in a mass transit vehicle with a replacement sacrificial member retention assembly, the method comprising: extracting a rubber gasket from a recess formed in the frame of the window so that the rubber gasket no longer retains the sacrificial member adjacent a first side of a glazing of the window, wherein the rubber gasket also no longer retains the glazing in the frame; sizing a rigid retainer such that the rigid retainer can be positioned in the recess; positioning a plurality of rigid retainers into the recess in the frame such that the rigid retainers are able to retain the sacrificial member adjacent the first side of the glazing, wherein the rigid retainers are also able to retain the glazing in the frame; and positioning a sacrificial member adjacent the first side of the glazing so as to be retained by the rigid retainers.