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Now I would use wedge as thrust plate, what are you using.

There's a 6x3 block driven at the angle of the bottom of the stay, up to 1m deep, if it wont go down you can dig it in sideways.  There's not enough stones of the right dimensions around here and you can spend longer (all day) looking for them so its a lot easier and quicker to supply a block.  I find it very annoying that merchants only stock strainers and posts and occasionally struts but I've never come across one that supplies a purpose made breast block.    

Sorry premnayloon but your wedge wouldn't do for me either, cant see how you can get enough ground contact, and those wedges split if you hit them too hard. Kiwis will go as far as putting 1.5-1.8m long blocks if needed so I don't see how a 30-40cm wedge is enough. Don't take it personally its just my opinion. 

Hey no offence taken! I've never had a wedge split yet and as I said the shape of it means it tightens with every hit, and it gets wider of course too. I

The guy I used to work for always used them and was renowned as one of the best in the area, never ever had a complaint or a strainer shift, but each to their own , wouldn't it be great for us all to meet up and share our methods.