Some time ago another member on here kindly advised me that this was the bearing for the kv6 , with the right numbers.....
https://www.ebay.co.uk/itm/Compresso...72.m2749.l2649
He was about to try a bearing replacement , by removing the pulley and fitting the new bearing to it . Unfortunately I have had no further contact since then so I don't know how it went , or even if the bearing was right
However , for £12 it must be worth a go ? I temporarily solved my noise with a regas but I might end up changing the bearing yet