How to say “Could someone tighten the bolts on the projector stand before we adjust the picture?” in Japanese

In Japanese

映像(えいぞう)の位置(いち)を調整(ちょうせい)する前(まえ)に、誰(だれ)か映写機台(えいしゃきだい)のボルトを締(し)めてくれる？

Eizō no ichi o chōsei suru mae ni, dareka eishakidai no boruto o shimete kureru?