Where did the missing stones go?

Sarsen Quern Fragment

Mike Pitts asks: "What happened to these missing stones? Who took them down and where did they go?

As I wrote some time ago: 

One of the mysteries of Stonehenge is what happened to the missing Sarsens. Assuming it was complete somewhere in the order of 300 tonnes of sarsen stone is missing. Apart from the edge damage caused by visitors it seems that complete stones were removed and that they were chosen from within the monument for some reason. Why take that lintel but leave the easier to remove fallen stone here? The stones don't seem to be present in any local buildings and it seems to odd to suggest they were broken up for roadstone when the easier pickings of the bluestones don't seem to have been so.

Julian Richards has suggested that one reason that sarsens were removed was for the stone to be used for producing grinding querns. There is very little stone in neighborhood suitable for stones to grind grain with and some sarsen stone types are very suitable, other less so. So a source of excellent source material may have been irresistible in the later Bronze Age, and a quern manufactory set up.

"East of (north Fargo) plantation the field system corresponds with an area of later Bronze Age activity identified by extensive surface collection in the winter of 1980-81 and subsequently sampled more intensively (Richards, J 1990 The Stonehenge Environs Project. HBMC: London ). The surface scatter consisted of pottery and large quantities of burnt flint and burnt and broken sarsen, including quern fragments, and was interpreted as a small nucleated area of later Bronze Age settlement, lying within the area of regular field"

Research Department Report Series 82-2011 

STONEHENGE WORLD HERITAGE SITE LANDSCAPE PROJECT LEVEL 1 FIELD INVESTIGATIONS ARCHAEOLOGICAL SURVEY REPORT 

Sharon Bishop

And from: The Stonehenge Environs Project, Richards, J., English Heritage (1990), ISBN: 9781848022096

I have also written about a possible fate for some of the bluestones, to become Roman Pessoi

https://www.sarsen.org/2021/02/bluestone-arse-wipe.html  

But maybe some of the circle never progressed from wood to stone.