cone ball in the hinges on a P3/75.

Which is the right way up for these cones to be fitted. i am replacing all the door hinges hard ware. as i was progressing with the change over i found one side had them fitted with the dome section down and the other side with the dome section fitted upwards. can some one advise on the correct fitting method, as i cannot find any illustration in the work shop manual. many thanks in anticipation. best regards derrick.