I also think they are all the same 1/4" size Dunc. BTW, for awhile SOG sold an accessory set of little wrenches to disassemble their tools:(Image removed from quote.)Don't see them on the SOG site any more though
I've got some of those too.http://www.shoppingthestore.com/index.php?main_page=product_info&cPath=1_48&products_id=136