[Startrek (Martin)]

The term “East Heavy” generally relates to the Ra axis of your mount and the logic behind it is to keep the Ra motor drive gears engaged or meshed at all times when tracking to reduce slop and play thus improving tracking and guiding ( also improves Ra tracking for belt driven mounts like my two EQ6-R’s and my EQ8-R )

East Heavy (Eastern side of meridian)
Scope on the west side
Counterweights on the eastern side
Balance mount level in Ra and Dec
Place mount in home position then slightly move counterweights down shaft towards the ground between 5 to 15mm depending on mount and payload

East Heavy ( Western side of Meridian)
Scope on the east side
Counterweights on west side
Balance mount level in Ra and Dec
Place mount in home position then slightly move counterweights up shaft towards mount body between 5 to 15mm depending on mount and payload

If your mount has more than one counterweight, usually you only have to move one counterweight slightly up or down

To be honest I’ve never bother using East Heavy on the western side of the meridian , I’ve just left it slightly east heavy on the eastern side for tracking towards the meridian and after a meridian flip on the western side descending towards the west.I haven’t noticed any issues with guiding in leaving it east heavy east on the western side, some folk obviously will see a difference especially at lower altitudes

Obviously Home Position in Southern Hemisphere is mount set level with front tripod leg pointing towards SCP , altitude set to local latitude and counterweight shaft pointing down front tripod leg

Hope the above makes sense

Martin