The motor pulley on my Spectrum 2-8-0 recently cracked and couldn't be fixed, so I designed and printed a new one. It's working great so far, so I put up the file for free download in case anyone else needs one!
Bachmann HO 2-8-0 Replacement Motor Pulley by DarthSantaFe - Thingiverse
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That's very generous of you. Mine still works fine but please report back on how well it holds out.
Simon