Q: I found this interesting saw on eBay. What can you tell me about it? —Paul Cooper, Yorktown Heights, N.Y.
A: Interchangeable blades allow this tool to morph from a crosscut saw (far left) to a pruning saw to a backsaw (for making dovetails) to a jab saw (for cutting holes in drywall). Getting four saws for the price of one seems like a good deal, but only if a solid connection can be made between the handle and each of the blades. Otherwise, it's just an unusual, and not very useful, artifact.