size

Looking to replace my 15" 6-spoke destroyer type steering wheel on 2002 228G: TeleFlex Marine, Sea Star model Helm 1.7 tilt HH5741 single station hydraulic. Grady, GW dealers, and Attwood (mfgr) can't tell what size shaft it is -- 3/4 in. tapered, 5/8, in., or something else. Any ideas?

If you have a 330 Express with twin F300, what propellers do you run? brand, diameter and pitch if possible. Repowering from F225, not sure on what propellers to run on the new setup. thanks in advance!