On Wed, 4 May 2016 05:35:41 -0700 (PDT), David
wrote:


But, given that there is only one small hole, about the size of a 50 pence coin,

I would say that's a fair size hole, I use a square of garden
fleece , a very small roll would supply you for years, lets the water
drain away, (I hear older gardeners used to use an old net curtain,
fleece is just easier and cheaper)