I think I'm a bit strong for it as I bent one of the levers first time...
Anyhow re bent it and...

So I have a good supply of sawdust and wood shavings...
So tried 2 options cup flour and 2ltr water andva good glug of PVA and 2l water... And mixed

Stirred the shavings into the "glue" solution
Now after the first go the excess liquid pissed all over the floor so a dig in the shed and a paint roller tray allows me to catch the run off and re use
Anyway

I have found the flour and water bricks keep their compressed shape the PVA ones are expanding like bread prooving in a warm room