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?