I currently have 2 different ones. One is the head off a miracle Grow fertilizer caniter. It works really well but it is slightly bowed and made of plastic so Im not sure if there is anything I can do about it..
I have another one off a garden irrigator. This has over 200 holes so I had to block some off. However it is made out of tin and I may be able to concave it.
Im going to look into it this weekend.
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