Derek Copeland wrote:
As far as I am aware, the LS4 has never been out of
production. A version called the LS4b is (or at least
has been) made under licence somewhere in Eastern
Europe, and features fully self connecting controls,
unlike the original.

The LS4b (with self-connecting controls) was manufactured by Rolladen
Schneider, and they were still producing them in small numbers right up
until their demise. DG thought they had bought all of the assets of
Rolladen Schneider (by then called LS Flugzeugbau), but apparently
another company also thought they owned them. Much legal confusion
ensued, DG ended up with the design rights and molds for the LS8, LS9,
and LS10, plus the LS spare parts inventory. The other company
apparently ended up with the molds for the LS4b (and possibly 6). Last
I heard, the molds were supposedly at the Sportine Aviacija (aka LAK)
factory in Lithuania, but AFAIK, no new LS4b models have been produced...