They are simple enough to make (says he who was considering buying one himself :) if you have the gear. The basic layout is as follows (wish I had a pic but maybe you'll follow).
I'll leave you to determine the actual size of your block but it needs to be larger on the 'flat' sides than the gasket between the pipes and the touch control (probably obvious). The thickness is determined by the size of the pipe fittings you'll use (more on that later) but you want it as thin as possible (to minimise the distortion of the steel pipes) while maintaining adequate strength. You then need 3? holes for the mounting bolts to pass through.
Now the really important bit.
If you closely observe the two steel lines you'll see one slightly larger than the other. This is the return line, drill your bypass block straight through at this point (simple enough). Now for the other line. In line with the pressure line (the smaller of the two) and starting from what will become the touch control side of the block drill 1/2-3/4 of the way through your block. Now drill in from the nearest (or most convenient for later hookup) edge to meet up with your last hole. Then tap for the hydraulic fitting of your choice and install.
The supply line for your open center valve should be plumbed into the pipe plug in line with the pressure line on the original manifold (at the end of the steel lines) and the return line is plumbed into the block. You may wish to consider adding a pressure relief valve as your add on system is upstream of the one already in the touch control and so it would be possible to 'dead head' the pump (1100-1500psi would be suitable). Hope some of that made sense, Sam
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