Demonic_Duck
Throbert McGee

Guys, you both wrong
Hard Л position (according to the diagram):
The very tip (17) is straight at the place where the upper front teeth meet the gums. (Roots of the teeth). And 16 (right near the tip) is touching the alveolar ridge at the prealveolar region (4).
Soft L position:
The very tip is touching the 5 and the 16 is touching the 6.

Oh, yeah, and guys, to sound purely russian you gotta keep your tongue middle higher than its sides. That's tricky for english speakers, but you may chuckle that it's tricky for us to keep the tongue flat when speaking English .