I'm still wading through a bunch of free stuff. The burnisher/tumble guy gave me this king size dremmel. Gonna try it on my wheels. From the solder guy I got these valve guide seat grinder guides, is that what they are? Seems like a lot of sizes for valve guides. What's this for? Got a small Atlas lathe with a bunch of tooling. What is this gizmo? Are these 'Engine Analyzers" good for anything beyond dwell or charging? Says something about cylinder balance.