I have a granite surface plate but that is a bit overkill for most. A sheet of glass works great for a flat surface. If you know anyone that works with granite counter tops that's a good source for a small plate, the sink cut outs.
I use wet/dry paper (400-1000) with a light cutting oil. A small piece of bar stock wrapped in emery cloth would do for deburring the hand slot and frame interior.
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