Has anyone replace the tritium in a Mepro 21

Meprolight tells me that the 21 isn't designed to have the tritium replaced.

I've replaced the tritium in an original occluded eye sight, but there was ample information on how to do that.

Does anyone know of any information on anyone doing the tritium change out or on how to DIY?

Thanks for the illuminator information. I'd rather try that gizmo out than tear into the 21 looking how to replace the tritium capsule.

The Mepro 21 is the first reflex sight I ever bought and the thing was perfect...until the H3 halflifed to a shadow of its former glory.