WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
Using the special tools, MD998812, MD998814 and MD998824, indicated below, install the 2nd speed gear sleeve.
Fig 1: Installing 2nd Speed Gear Sleeve Using Special Tools MD998812, MD998814 & MD998824