Board Thread:Questions and Answers/@comment-35812368-20180803181315/@comment-33295205-20180804013201

LittleHornyZeroTwo wrote: also where to farm screws? If you're looking for screws, you have two options. You can do them by completing weekly, monthly and quarterly quests. There are some one time quests gives out screws too. Just need to check the quest requirements. Second option is you can buy them through Akashi cash store which cost 700 yen per 10 screws.

As Fagdom user mentioned above ships, you can farm Proto 41cm triple gun but also require blueprint so keep that in mind.