Hey Tim, not sure if this will help you any, but I am subscribed to these guys on youtube who sell bladesmithing and knifemaking tools and supplies etc. They are based in Australia however, but I figured I'd share this with you just in case. Anyway, they just uploaded a video advertising their new large radiused platen sizes in 36", 48", and 72". I'm not sure which other grinders platen attachments they will fit besides their own model , but if the bolt distance on them are not the same as Nathan's, then I'm sure it wouldn't be that hard all all to make a new platen backing to accommodate one of theirs to your grinder if you were to get one.
Here is the direct link to their site with the radiused platens, but I'll post the video below anyway just so you can see what they say about it, as I haven't taken time to watch it yet. Hope you're able to find one man! :thumbup:
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