Ya know all about that last sentence. Just saying x-tough I dont think is the Tsumura made bar. It's never had oil hole since came out years back either as shown in my pic.This is a Husqvarna brand guide bar (X-Tough). @bwalker wrote that it's made by Tsumura, but that's not necessarily true. It's made in Canada probably.
Husqvarna sources their X-Tough Light bars from Tsumura/Suehiro Seiko Co. (4 sprocket rivets) and Sugihara/Diatop Co. Ltd. (5 sprocket rivets) depending on the market.
Tsu, Sugi, Husky