A junior hacksaw blade handheld and with the end pins knocked out cuts a very
slim slot. This inevitably gets wider as you trim back to a circle thats round!
Alternatively, a thin sharp blade. But lots of patience needed.
Finally, if the inside of the lid you have made is laidup around the edge during
the process of reinforcement, then the edge can be extended back out. Its also
possible to laminate in some washers at the hole locations at the same time.
Have done all mine using a combination of the above and am happy with the
result. You could perhaps also try deeply prescoring the hole with a pair of
dividers which would assist the hacksaw in following the desired route.
Rgds. Duncan McFadyean
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