PVS plugs

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Dave A

#1
Going to 'play' with different 4 blade props this weekend. Never worked with PVS plugs before but I will start drilling them out (start with solids) until I find something that works.
Can/should plugs be drilled out 1 @ time or should plugs be 'drilled' as a set.
How dramatic of a change should I expect? Would drilling out 1 or 2 plugs 1/4" at a time have a huge effect?