[pianotech] is there a tool for this

[Larry Fisher RPT]

Any ideas how to unscrew this?
Is there a tool made just for this?
Any home made tool designs someone might want to share?
Two #10 WNG bridge pins fit into each recess but will not budge it when I
turned them with a big crescent wrench.
Possibly some square steel rod that fit a bit better would be helpful. 
Thanks,
Gene


I’ve made spanner tools to undo these in the past.  Give me some dimensions to work with and I’ll see if any of mine will work.  The last one I made out of square tube stock.
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