Present simple vs Present continuous

[Will17]

Hello!!

Is the use of the present simple correct in these cases?:

"If the fabric loosens, you can use these wooden pieces to stretch it."(Would it be better to use the present continuous?).

Thank you
W

[2006]

Hello!!

Is the use of the present simple correct in these cases?: yes

"If the fabric loosens, you can use these wooden pieces to stretch it."(Would it be better to use the present continuous? no).
The sentence doesn't make sense to me. 'If the fabric shrinks, you can...... stretch it.' would make sense.
Thank you
W

2006