You can get replacement lids for the waste outlet of cassettes for about £4 in most chandlers.
Ask me how I know this.
When the crew rang to report the problem I told them they were not the first people this had happened to and they will not be the last
Edited to add We are going to go and have a look at Python tonight and the draw of having a decent pint at Samuel Barlows rather then continuing our journey to our own boat where there is no longer a decent pub may prove too much.
I feel a pre banter coming on if anyone is already there - if not we will just test the beer to report back to you all.
Edited by cheshire~rose, 16 August 2013 - 05:46 AM.