Regarding the TCT groomer/verticutter blades, there seems to be only a couple of major suppliers of these, both in the US.

JRM, http://www.jrmonline.com/

Woodbay DynaBlade http://www.woodbayturftech.com
Blade pics are at http://dynabladesupplies.com/purchase-blades/ but don't give centre hole size.

Both of these companies list Oz agents; Golf & Bowling Machinery have JRM.

Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."