Inquisitor 1928: Dyno-Rod by Triton

Two grids for the price of one this week.
 
Preamble: The answers must be entered in grid 2. Every clue has a misprint in the wordplay which must be corrected before solving; the correct letter is to be entered alongside the clue label in grid 1 (e.g. for clue A next to the letter A), while the letters replaced spell a message.

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