I am struggling to install the bolts in the threaded part at the end of the Aluminum Pieces, am I going to damage the threads?Updated a year ago

No. Instead of forcing the bolt in, try threading it in before installing the piece that is going to be held by the bolt. Sometimes, residue from the powdercoating process finds its way in the threads and makes it difficult to turn the bolt on the first attempt. Forcing it may result in the threads being stripped.