newbert

I need to shorten the boom length just a small bit (1/2 inch?) on my newly purchased HP Velotechnic Scorpion FS26 and I can't get it to budge. Per the scale on the boom I'm currently at 245,, but I need to get down to 240 or a just a tad lower. Does anyone know what the minimum boom length is on the FS26 without having to cut the boom to shorten it? I've undone both bolts per the instruction booklet and it still won't slide in at all. Either I'm doing something wrong or the boom is already at its minimum physical limit.

Thanks!