Special provisions for seismic load-resisting systems for all engineered wood structures requires consideration of diaphragm ratios, horizontal and vertical diaphragm shears, and connector/fastener values.
Originally, the procedure was typically performed with modified wool-trimming metal shears, but now there are similar metal shears designed specifically for mulesing.
Attachments, such as breakers and compactors only need hydraulic flow in one direction, whereas thumbs, shears and grapples need two-direction hydraulic flow.