Bt Doc, On standard hinge pins the bell housing holds the threads for the pins to screw into.
On High Performance hinge pins the bell housing holds a smooth but tight bushing #
23-847637 so the smooth hinge pin can be slide hammered into the smooth bell housing bushing....The high performance gimbal ring doesn't hold a smooth bushing as the ring is sized from merc to fit the H-P smooth hinge pin...(That I recall)...,But the bushings are all the same part numbers
23-847637 that fit into the non threaded H-P bell housing or standard gimbal ring as again the standard bell housing is threaded.
In here see both bell housings item number 1's and hover your mouse cursor over the notes for details then see bushing item number 6 and it's note too...,
https://www.mercruiserparts.com/bam/...30967/1943/180
In here for the H-P ring, see the second set of item number 1 down the list of parts and see items 10 and 11 and notice no bushing item number 3 (
23-847637) listed like in the first set of part numbers of item # 1,
https://www.mercruiserparts.com/bam/...30967/1943/170
https://www.ebay.com/sch/i.html?_fro...74A17&_sacat=0
https://www.ebay.com/sch/i.html?_fro...odkw=822374A17