Here is how to install a bolt in a tight spot. If you can’t get to the back of the hole, and you need to install a carriage bolt, you can feed a wire through the hole, and then duct tape the bolt and washer to the wire. Pull the wire back through the hole, and the bolt will come out. This works great with carriage bolts and carriage bolt washers.
website:https://www.jhmindustry.com/
Shanghai Jian & Mei Industry and Trade Co., Ltd. is the company which manufacture and export fasteners and metal hardware, founded in 2006, with import-export authority. Now, 80% products export to all over the world and 20% sell in domestic market.