What did they fill them with? If it's anything other than brass I reckon it'll blast them out. Chemical stripper will probably weaken or completely erode the filler as well, depending on what it's made of...
What did they fill them with?
That's the main question that we need to find out the answer...
The frame looks like in pretty good nick, try stripping the paint using nitromours....
@AlphaOmega started
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What did they fill them with? If it's anything other than brass I reckon it'll blast them out. Chemical stripper will probably weaken or completely erode the filler as well, depending on what it's made of...