Need Help with Scubapro MK25/S600!

[DeepScuba]

Yeah it vibrated my lips it was so bad. Of course I was checking for the sea lion that I thought was trailing me.

The IP external adjust is better than unscrewing/shiming/unscrewing/shiming

Truth be told, my HP O-ring was a little knicked which helped it honk along too.

 

[Oli]

I am pretty happy with my MK 25 and S 600. The only concern is maintenance.
My S600 was trapped with sand, and I couldn't clean it up. Tried to unscrew it for a few times, but it didn't open.