Boo Boo,
Hopefully you have resolved your problem by now, if so forgive the belated reply. I just typed "remove tea stain" into google for you and got over 10 pages of sites with ideas for you.
Best of luck, Yogi
Absolutely right! If you have to hang the hood onto screws and let it drop to the support bracket you will always have a gap of approx 5-10mm depending on the fixing bracket. This would sometimes be covered by a special collar supplied with the chimney or would normally be sealed with silicon...
The platform approach would be the strongest and safest approach for raising 10", however a quick solution for non-weight bearing could be to use lengths of 2" x 2" with steel reinforcing brackets. For added strength a steel rod drilled up through original leg and down into extender would reduce...