After seeing that the SNS Travel Kettle Grill (which is really a hot-rodded Jumbo Joe knock off) has an OTC type ash sweep, I remembered reading about a Jumbo Joe OTC mod on another forum. It
was such an old topic, that the pictures were deleted. So, after searching "Jumbo Joe mods," on YouTube, I came across this video. It gives an overall good idea of how a OTC can be installed. And,
opens up endless possibilities for other mods.