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@H-Bomb
Ok,
So I've built all my mallets with M6. M5 will work, but you have to cut the pole lower done, on the Perros it's only just above the notch.
I use a standard M6 nut, and 40mm M6 countersunk hex bolts
I used to use longer bolts, if you are doing it for the first time maybe go longer, it'll give you more room for error, if you cut the pole to short the nut will just get pulled through.
I countersink my heads a little bit, so that the bolt is flush with the plastic. Just be careful not to go all the way through (very easy with the thin black plastic).
I drill a 5mm hole in the bottom, so that the M6 bolt will grip it that bit more.
I used hex bolts, as it wears a lot less than phillips or flathead, I previously used those, and at some point you can't unscrew it. Also there are always allen keys at polo.
1m rod should do it.
Clerkenwell Screws sell the bolts in all lengths, Leyland sell the threaded rod.
I'm happy to show anyone, I usually carry bolts with me, and it's easy to unscrew the head if you want to have a look.