How to remove left sidebar from a post in BP Social

How do I remove the left sidebar from a post in BP Social?

I've tried removing the following on line 56 of single.php, but it removes both sidebars.
<?php get_sidebar('left'); //init left sidebar ?>

I'm trying to get a post to stretch across from the left, missing out the left sidebar, so the main text has a bigger area.

This is a seperate post, using a single post template plugin, so I can't do it from admin as I will be using the default 3 columns on some of the posts.