http://i134.photobucket.com/albums/q115/davidf_photo/Picture2.jpg

this idea is  working rther well at the mooment...

the wider bigger cones at the bottom made quite a lot of difference.

have since put wider cones ontop of the granit slab (not ssuch a  difference)....+bigger BBs all round..

Am now down with a cold (again) so how  much i'm going to hear at the moment..... don't know