Chickering Wippen Flanges (brass)

[Thomas Cole]

I'm rewhatevering a 1911 Chickering grand which has brass flanges for 
hammers and wips. The hammer flanges are beefy and holding up well, but 
the wippens are starting to break a few tongues at the notch for the 
center pin. About a dozen are no longer able to hold the center pin 
tightly. Anybody have some to spare? Better ideas for repair?

Tom Cole