TomE used an Omten 1217, had to file down the edges and ends a lot to get it to fit.
Here is the post Review: SK73 clone from Dealmetic: "Zeusray" Beamshots added, whitewall shots still to come - #14 by Tom_E
How did your switch fail? Did you take it apart and examine the innards yet?
You can get it out by pressing hard on the green button and the white retainer will pop out.
I have to periodically adjust the tab on mine as it looses contact with the body.
I actually shimmed the tab out a little with a piece of paper behind it to get better contact.