I have a Series 1 Mk1 rigid ram Interact. I am rebuilding the upper head to try to get rid of the racket. To remove the motor, you need to remove the head from the ram. In the instructions, there is nothing said about alignment when reinstalling. Is there any alignment procedure? Are there hidden keys or dowels that align it? There is something vaguely shown in the cross section, but no part numbers or descriptions.

On mine, I notice there are brass shims under the top two fixing bolts. Would these be factory or some later attempt to correct alignment? Also on the lower right side fixing bolt, there is a hex washer or nut or something underneath the socket head cap screw. Is that an eccentric or adjustment of some kind?

Any help from someone who has had this apart would be greatly appreciated!