This site:
http://www.asignobservatory.com/
has a DYI page on a simple mod for existing piers using the tripod head. I just set it up and it appears very solid.
Instead of the tripod bolt I got a matching 5" bolt and nut. Attach the nut first, thread bolt up into the mount and fasten from underneath with the nut.
Only problem for me is it is quite tall with my 1.8m observatory walls. Scope has to be below vertical to open and close the roof. Will have to try and figure out how to custom park in the horizontal. Manual is no use here.