Yes, Keith, we see the problem. But why can you not (as John Sandham has suggested) provide us officially with your list of suppliers so we may purchase parts (components
etc.) directly from them? Wouldn't "all bases be covered" in that way, or is it really because you want to protect your margins when supplying individual parts (if you indeed do that at all)?
On a slightly different tack, there are many examples where hospital biomed sheds have no alternatives to buying assemblies, when all they really wanted was a particular component on/in that assembly. We know that there may very well be valid
supply side reasons, but again, openness about original suppliers would be the answer, would it not?
And, as regards recovering your costs, surely you do that when you sell the equipment in the first place? If not, then, a) Why is it so expensive? or b) You got your sums wrong!
