I don't recall ever mentioning what the actual 10-day MA was, because it wouldn't mean anything to anybody but me.
The idea is that if you keep track of this moving average and reference to historical numbers, you can get a good idea of market extremes. The idea is that once an extreme is reached, you average into positions to mitigate the risk.
To do this you will need up and down historical volume back 10 or 20 years, or more. You can get this from Masterdata or some other source.
In fact, give me your email address and I may send it to you.