I have just finished rebuilding my garden wall, and wondered if I could save a bit of money buy making my own pillar caps (I need 10). Problem is, I don't know the best way of doing this. I presume I make a wooden form, use a sharp sand/cement mix, then pour it in the form, and make sure I put a drip slot. I also presume I need to use some form of liquid/oil whatever to ensure the cap doesn't stick to the form, also it should not colour the concrete. I am hoping someone can give me some idea of the best approach to this.