I noticed my Skywatcher EQM-35 Pro had quite a bit of play between the mount head and the tripod. When polar aligning the azimuth adjustment screws would often just shift the whole head to the side rather than rotating it, making fine adjustments difficult and actually reducing the useful range of adjustment

This bushing almost fills the gap between the two mating parts so that the mount head turns smoothly when adjusting azimuth and removes almost all slop/play in the connection.

I am not sure if other Skywatcher mounts have the same size parts as I'm only new to astronomy but I suspect this will work with similar mounts like the HEQ5 and some other Skywatcher/Synta/Saxon mounts.