non sentence ending な in this comedic conversation


MC spots girls A and B who he recently got to know. C = childhood friend of
MC.

> A「あ、先輩。こんにちは」
>
> MC「おう、A。Bも一緒か」
>
> B「何よ、アンタだってC先輩たちといつも一緒じゃない」
>
> MC「何だよ、仲良いなって意味で言っただけだぞ」
>
> B「アンタが言うとそう聞こえないのよね、不思議ー」
>
> MC「ヒネくれてんなー、さすがはレンチ **な** だけある」
>
> B「ヒネる工具 **な** だけに？って、全然上手くないわよ！！」
>
> (MC) おお、意外にノリがいいな。

MC:「おう、A。Bも一緒か」

B:「What about it, aren't you always with C-sempai?」

MC:「Huh、I'm only talking in terms of how close you two seem.」

B:「If you say that, I don't hear it that way (feels like you were insinuating
more), strange.」

MC:「Rebellious aren't you, as expected of just a wrench.」 (a play on ひねくる vs
ひねくれる)

B:「As expected from a wrench tool？ That was not a good joke at all!!」

(MC) Unexpectedly she got the joke.

* * *

"仲良いな"って意味 and ヒネくれてんなー are normal sentence ending な, but how was ヒネくれてん
abbreviated?

What are the な in レンチ **な** だけ and ヒネる工具 **な** だけに?




> are normal sentence ending な but what how was ヒネくれてん abbreviated?

てん is a short slang form to ている

> what are the な in レンチなだけ and ヒネる工具なだけに?

According to The Dictionary of Advanced Japanese Grammar, the pattern
**（さすがに）~なだけのことはある** is an evaluative comment on something contributing to a
remarkable, expected result. I presume なだけある is a short version of
なだけのことはある...

So, the result in your case, is ひねくれる, and the natural reason contributing to
this, is, that B is a レンチ.

I've found the same question asked also here, for reference to the short form:
<https://eikaiwa.dmm.com/uknow/questions/4278/>

