Cat 310 Masthead Sheave Size

[whittem]

Anyone know size/dimensions of the two Catalina 310 masthead sheaves? I called Catalina Largo FL factory and they did not know.
Catalina 30 has 2-3/4" OD, 1/2" ID, .57" Width, ball bearings, Torlon material, max line dia 3/8".
Catalina 320 has 60mm OD, 10mm ID, 14mm width, max line dia 3/8. Not sure of material or bearings. 320 mast is French
Anyone know which boat 310 is closest to?

 

[valcour]

My best measurements are 3/4" Wide x 1/2" ID bronze bushing x 3 3/16" OD X 2 1/2" dia on the rope bearing surface of the sheave.
see https://forums.sailboatowners.com/index.php?threads/masthead-sheave.175144/&highlight=sheave