A unique way to assemble a set of second-stage anvils for a cubic multianvil apparatus when used in a 6-6 mode is proposed. A plastic frame supporting the second-stage anvils along with a newly designed tool allows us to assemble the second-stage anvils within a few minutes. The precision of anvil alignment is even better than the one attained by the ordinary method, which assembles the anvils within a metal frame in a quite time-consuming way. In situ experiments utilizing a synchrotron x-ray source proved a stable operation under 1500 K and about 10 GPa. The quick and accurate assembling feature of our device may ensure a minimum loss of beam time given in such a facility.
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