Natural energy is useful here. Depending on the sigil of the servitor and the kind it is (some react differently to other cosmic energies) you could simply make the servitor solar powered, for example. Likewise as far as "tagging" your sigil in bathrooms is not entirely a bad idea. The image itself can be descrete. For example if you placed the image on the underside of the toilet or within the tank itself no one would realize it is there or that it is drawing energy. It would be very unlikely that anyone would detect it. Although in my opinion a toilet is not exactly the most dignified place for such a sigil you could also enscribe the symbol underneath book shelves at a library too.
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I was tempted to adopt the idea of putting the sigil in various places online however by a thread on occultforums.com which suggested that putting a particular sigil in a large number of different places greatly increased the amount of energy that the sigil would receive from various sources.
I second this. Think of it like having multiple solar collectors. 10 are far better than one.
An image only has as much power as you give it. Consider posting the image in one spot as apose to 100. If you place it in many different spots it'll draw more energy. You probably only want to draw as much energy as you need. Energy that is not used is sort of like excess calories in us - it gets stored as fat. In the case of the servitor storing some energy would come in handy but I think you'd end up wasting alot if you stored too much. You could inadvertently create a fat piece of ham for some energy leech.
A person who would attempt to subvert this from you would only be able to take control if the amount of energy you put in. It is possible they could use it to link back to you sort of like a straw in a glass and suck up energy but as bym said you would know. A severe headache, or unexplained stomach ache, dizziness and so forth could indicate someone or something is trying to draw energy from you. You'd be able to respond appropriately. Realize an adept energy manipulator would not need to tap into your sigil to draw energy from you, it is just one way they could do it.
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However, I am perhaps beginning to think that, rather than the primary sigil itself, for such a purpose perhaps a secondary linking sigil might be a better idea. That could perhaps still act as a proxy for a transfer of energy to the main sigil, but it would be a slightly less direct link, so it could perhaps be a bit less dangerous.
This is actually exactly what I was thinking while reading your post and I think it is an excellent idea to try. It would work as a sort of safe guard to off set anything that might try to tap into you.
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Can I perhaps then ask as another question...are there any of you here who have actually seen your servitors (again, even if only momentarily) and if so, can you offer me any advice on how I might possibly achieve the same result?
You would not need to work with much energy at all to percieve your servitor. Remember that when dealing servitors or really any entity made of pure energy sometimes our main sense alone are not enough detect them.
It is necessary to become proficient at inducing altered states of mind. I work almost exclusively through lucid dreams and astral projection. When one is in such stages of mind their perceptions are opened up to experiecing hyper-realism, or sensing over and beyond what we normally do. Within these stages of consciousness one can directly see and communicate, more over experience otherwordly beings of any sort.
Of course you still would not have any mundane evidence of the existance of the servitor and really so long as it fullfills its function that should be proof enough. I have heard it is possible to physically manifest servitors. An example with some scientific basis is that some paranormal researchers believe that poltergiests are really manifestations brought on by individuals who have uncontrol telekinetic abilities coupled with repressed feelings of anger, guilt, saddness and so on. In other words poltergiests are the accidental products of people themselves and are not actually beings independant of an individual.
Like wise a servitor is similar to the speculated poltergiest, it is a manifestation created by a person. I see no reason why a person cannot intentionally manifest such a being physically. However if poltergiests are the product of uncontroled tk abilities and repressed emotions, then I would imagine it would take an equally profound tapping of the mind inorder to accomplish this feat - difficult but doable.