Favourite "button" cactus?

Hi all,
I've just got a Gymnocalycium damsii that I spotted at Bunnings and couldn't leave behind; it's a huge clump of little buttons all connected together, I've never seen anything like it in real life (but I have seen some pretty darn amazing things on here). I'll get a photo up on Tuesday when I get home but the point I'm trying to make is that I have become really interest in button style cacti and am curious what some of your favorites are?

I think the word you are after is "globular". To me nothing beats an advanced pelecyphora aselliformis clump, seconded by a very old seed grown loph.

Cheers for the tip sneaky, button has the wrong connotations. I read too much Don Juan in my high school days. Is there any way to encourage cacti to clump or is it all luck of the draw?

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Some cacti never clump and some could take many, many years to begin lateral growth. All depends on the species. I have found the most reliable way to make a cactus clump is to graft it. Even some species that are usually solitary can begin to clump heavily after grafting. Nice Gymno by the way.

Interesting indeed.
Looks like I'd better start cutting up some Peres.

If this topic is about globular cacti then I would have to say (at the risk of going a bit too far) that my favourite is Echinocactus platyacanthus.

You can force offsetting by destroying the growing point i have drilled into Golden balls to force offsetting. Love the gymno damsii it was one of my first cacti and one of the first that i started to pull heads of and propagate.
Grafting is good but for larger plants apical core drilling is recommended. I will try to upload a photo of one when i get the chance.

Hey cool. I have heard of inserting a hot needle into the growing points of smaller cacti but drilling into it is something different. How do you protect from disease after the 'surgery'??