On Thursday, October 18, 2018 at 5:19:34 PM UTC-4, Ouroboros wrote:
Here's a link to a copy of the manual:
https://drive.google.com/file/d/1TUV...w?usp=drivesdk

I only see mention of a maximum all up weight and maximum non lifting parts. The manual does have a table for maximum water ballast carried depending on cockpit load, but again is only limited by max gross and non lifting parts.

The manual(note it is for a 19B) is clear. If you have the weighing info that provides wing weight,in addition to total empty weight, you can determine the max pilot weight for that glider based upon max weight of non lifting components. The manual specifically describes fairly heavy pilot mass in the cockpit.
If it is not a B, there is descriptive info on the Schleicher web site on how to do so. It is not a big deal.
Been There Done That
UH