<VV> Adjusting front drum brakes

[Ed Orbea]

I need to adjust the front brakes on my 62 Monza coupe. This hop manual
says to use the adjusting hole on the brake flange to access the adjusting
screw. However on my Corvair the brake flanges still have the metal
knockout plug in place. What options are there to remove these plugs? I
don't want to just take a hammer and possible damage the brake flange?

Thanks

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*Ed Orbea*
Poulsbo, WA