Second note is highly ungrammatical.

"Yukari!! You really don't have anymore of those Potato masher!?"

Should be one of:

• "Yukari!! Do you really not have any more of those Potato mashers!?" - closest to current TL, but doesn't sound very natural.
• "Yukari!! Do you have any more of those Potato mashers!?" - hybrid
• "Yukari!! Do we have any Potato mashers left!?" - most natural, furthest from current

In all cases, "masher" should be plural.

Arcana55 said:

Second note is highly ungrammatical.

"Yukari!! You really don't have anymore of those Potato masher!?"

Should be one of:

• "Yukari!! Do you really not have any more of those Potato mashers!?" - closest to current TL, but doesn't sound very natural.
• "Yukari!! Do you have any more of those Potato mashers!?" - hybrid
• "Yukari!! Do we have any Potato mashers left!?" - most natural, furthest from current

In all cases, "masher" should be plural.

In the original sentence "really" is written in katakana (vaguely similar to capitalized words in English), so leaving it out doesn't seem right.

Moreover, the phrase "potato masher" doesn't quite capture the model of stick grenade specified under the furigana, so it probably should be spelled out in the translation.