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@Rik_Van_Looy
^ Not really. Primato is ISO taper and UN26 is JIS.
If you install an ISO crank on a J.I.S. spindle, it will sit about 4.5 mm farther out than it would on an ISO spindle of the same length. (source: sheldon)
You can do it if you have to, but it'll mean you'll have to bodge chainline