On Yamaha trumpets that use a waterkey assembly where the saddle and nipple are integrated into the same piece, the distance between the saddle and nipple is different on the main tuning slide assembly and the 3rd slide assembly. In other words, you can't just take a MTS assembly, bend it to fit the curve of the 3rd slide crook, solder it on, and expect that the 3rd slide waterkey will fit on and properly cover the nipple. In reality the nipple will be just out of reach of the waterkey cork, though using a mushroom cork might fix that.
Have you figured out that I tried to do that very thing today? I didn't have any 3rd slide saddle/nipple assemblies, but I did have some for the main tuning slide, so I fit one to the 3rd slide, solderered it on, and only then realized that the 3rd slide waterkey was too short to reach the hole, and using a main tuning slide waterkey was ugly because the tail sticks out so far at such a weird angle. Through some careful bending I made the cork just b-a-r-e-l-y cover, but it wasn't a pretty job and I'm not especially proud of it. Although the saddle/nipple assembly did end up fitting nicely and soldered on quite neatly.
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