Just seen this on ebay:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=2454351748&category=9891http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=2454351748&category=9891
Well worth it for those who still run original valver size. Not sure if Willy also used these as standard.