The turf is taken off either with the breast plough - a paring tool pushed forward from the breast or thighs by the workman - or with specially constructed paring ploughs or shims. The depth of the sod removed should not be too thick or burning is difficult and too much humus is destroyed unnecessarily, nor should it be too thin or the roots of the herbage are not effectually destroyed.
Underneath the magneto you will almost certainly find one or more thin shims, fitted by previous owners.
It also seems that the need for client-side shims, or some form of run-time on the client side, cannot be eliminated.
The final portion of the protocol defined by the OHP 1.2 specification is the client- and server-side shims.
Supplied in pairs complete with hardened steel socket cap style mounting screws and stainless steel bearing shims.