Look for a Bianchi 9R holster. It's the lineal descendant of the old Berns-Martin Lightnin' upside-down, spring-loaded clamshell shoulder holster. Mine holds a 3" HB S&W M-65 like it was made for it (well, OK, it WAS made for it), but will also work well with a 2-3/4" Ruger SP101. Bianchi added belt loops on both sides to make it an ambidextrous belt or shoulder holster, which did nothing to improve the design, IMHO. There's one up on e-bay right now, but it's for a S&W J-frame 2" .38 (the description is wrong in the listing, but you can clearly read the holster's markings in the photo).

Ken Null's holsters are some of the best designed, best executed items on the market. I'd suggest checking with him a bit before you dismiss his offerings out of hand, based on one photo on his web site (his site could use some improvement!)

Null's holsters, or the Bianchi are both inherently more safe than the elastic retention style you mention (which may have been made by Brauer, BTW.)

Regards,

David