I was briefly looking for a replacement platen for the 1SM myself. I had a hard time locating anything and the stock platen is annoying. Not only is it too big, it's also folded on one side, which makes getting to the base of a blade difficult to impossible on one side.
After looking very briefly I discovered Grepper's KallyRest. If you're not familiar, this device has a very nice platen. But it's primary purpose is to be an angle guide for sharpening. A very nice angle guide! It's probably quite a bit more expensive than just a platen, but it does a lot more. Here's an introductory video I made about the KallyRest. It only shows the platen briefly, but it's there.
If you want a more detailed look at the whole thing, including very clear views of the platen, see my video on assembling and installing the KallyRest here:
https://youtu.be/s6knRomh1Qg
Good luck in your quest.
Brian.
After looking very briefly I discovered Grepper's KallyRest. If you're not familiar, this device has a very nice platen. But it's primary purpose is to be an angle guide for sharpening. A very nice angle guide! It's probably quite a bit more expensive than just a platen, but it does a lot more. Here's an introductory video I made about the KallyRest. It only shows the platen briefly, but it's there.
If you want a more detailed look at the whole thing, including very clear views of the platen, see my video on assembling and installing the KallyRest here:
https://youtu.be/s6knRomh1Qg
Good luck in your quest.
Brian.