Yes they should be round- the belt doesn't like to wobble very long till self destruct (got to remember your new part was shipped from somewhere and moved with equipment and humans!). The drive/clutch when installed properly shouldn't slide freely at all. assembly- spacer next to engine (this may vary in thickness, lines up back pulley with driven back pulley)- back pulley over crank shaft-brass bushing over back pulley shaft-belt with the flat side of it towards the engine-keyed shaft sleeve-clutch (part with the springs & pins)-clutch bell/cover- thick washer-bolt into crank shaft- If this doesn't match how your's is assembled you might have missing parts. Any chance you can post pics? It's so much easier to troubleshoot assembly when you can see it!
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