First thing to say is:

do NOT use the supllied hinges!

They are crap, yes they are, all of them. If you have 20 of them, 15 will come with backlash right out of the box, the other 5 will develop this in the first few flights.

In the beginning of this thread, there are several people telling how they used those hinges without issues, don't believe them, this isn't true. If you want to fly masters, you will notice sloppyness on those hinges.

I did install the original hinges and had to replace all of them. I did this by simply drilling them out using a dremel and a 2.5mm drill.

Only problem I encountered; in the ailerons; once you drill the original hinge stub out of the aileron, the last piece of it, which sticks through the wood and therefor is nog fixed to anything, will fall into the aileron, without any way to get it out. The solition to this is to wiggle your aileron so that this loose piece is close to the hole you drilled, and then drop a few drops of thin CA in the hole, glueing this loose piece to the aileron on the inside.

It's either that, or cut open the aileron on several places to remove them.

When mounting different hinges, ie the robart hinges, make sure that they are supported all the way up to the actual hinge-point, or you'll still end up with some backlash.