How to Get a Makeover in Mouse P.I. For Hire (& Unlock Tammy's Bearings)

Tammy’s Bearings in Mouse: P.I. For Hire looks closed at first, but it opens after you finish the main mission Bandel’s Laboratory and return to town.

Once unlocked, Tammy Tumbler’s workshop becomes an upgrade shop where you can trade schematics for weapon upgrade tiers.

This matters because it’s an important progression point, and players may miss it if they assume the location stays inaccessible.