Ukusika umsele Ukuphinda uxube Indlela yodonga oluNzulu (TRD ngokufutshane) yahlukile kwindlela yoDonga oluxutywe nguMhlaba (SMW).Ngendlela ye-TRD, izixhobo ze-chain saw zixhonywe kwicandelo elide lexande "isithuba sokusika" kwaye lifakwe emhlabeni, ukuba lihanjiswe ngokunqamlezayo ukusika kunye nokugalela i-grout, ukuxuba, ukuphazamisa, kunye nokudityaniswa komhlaba kwindawo yokuqala, ukuze yenza udonga lwe-diaphragm olungaphantsi komhlaba.