I don't know what "bat wing" is and I've never tried to make a diaphragm for the adaptor. If you figure out how to repair/replace it please share with us!
Mike B
X2 I've got a 59 cluster with leaking diaphragm.
BC 1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc 1949 GMC 250 project in waiting 1960 C60 pasture art Retired GM dealer tech. 1980 - 2022
