Russian / Soviet 73mm blank round for 2A28 / SPG-9

The Soviets (and Czechs) had a 73mm blank round for the 2A28 low recoil gun and the recoilless SPG-9 (both using the same projectiles).

The projectile consisted of some cardboard tubes, some plastic parts and a partial filler of plastic granulate.

Has anybody images or the manual for this round?