[john70t]

Hmm what sized hole?
The https://en.wikipedia.org/wiki/Messerschmitt_Bf_109 had (x1) and https://en.wikipedia.org/wiki/Messerschmitt_Me_262 had (x4) 20mm https://en.wikipedia.org/wiki/MG_151_cannon or 30mm https://en.wikipedia.org/wiki/MK_108_cannon.

The https://en.wikipedia.org/wiki/Messerschmitt_Bf_110 had (x1) 37mm FalkeEins - the Luftwaffe blog: Bf 110 G with 37mm Flak 18 cannon - Zerstörer (1)

The https://en.wikipedia.org/wiki/Kawanishi_N1K had (x4)20mm https://en.wikipedia.org/wiki/Type_99_cannon