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I have the Johnsonian VI that I bought from Bintel over 10 years ago. This was the economical version of the Johnsonian V which had more features. With the VI you just sit the complete Dob with ground board onto the platform. Some designs require you to remove the ground board which makes them a bit more stable. Rubber feet on the ground board stop the Dob from slipping on the 'VI'.
Not sure if anyone in Aus sells any these days. Johnsonian are no longer available.
When casually observing and hopping from object to object I don't use the platform but when planetary observing especially Mars, the platform is a must for comfortable viewing over extended periods. Resetting the sector is very easy and takes a few seconds.
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