So I recently acquired an older 8274 that was partially disassembled. The end plate has three parts as pictured and was obviously altered by a previous owner. My question is this, How does this end plate and parts actually assemble? Note: this end plate predates the newer version that has a end plug that is held in with two machine screws. I'm trying to figure out why the modification was made and the order that the parts should be assembled in.