Meccano Gears

Hi all
In a further attempt to get my Peco turntable motorized, I've found the
instruction ***! and I need a large gear wheel (Meccano 27b or c) and a
worm gear (Meccano 32).Both have 4mm hole for shaft.
Where in the world can I get this, or similar?
I'm in the US so will need mail order.
I've seen them on E Bay but a bit expensive!!
Can anyone help
Rob


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