Yup, the axe was taken to the PAS officer at Devizes museum.
The Silbaby alignment is diffcult to capture when it is cloudy.
It does work with an astronomy program tho.
There is an archaeo student working on knoll down who will publishing about this alignmnet this year.
I don't think that the whole Avebury complex is based around just one alignment tho,
PeteG