I appreciate the difficulty in working with the mosaic , and the problems associated with determining the size of the objects in the photos, .....a real challange. I appreciate the effort.
Some observations, ...I note that the tubular object in the attachment below , seems to have a pyramid shape on the tip, much like a common nail , or spike. The cylindrical object, that has been described as being flattened on one end, (and if the circular objects I outlined in the attached image are attached ), it reminds me of one of those keys, used to open a spam /sardine can,... red outlining the curved portion , yellow outlining possible parts of the lid removed in the process.