Ya, that was my typos, it should be the "rap-bolting".
Only after the Yosemite revolution with Yvon Chouinard and Royal Robbins, and later on Ron Kauk, did this idea come back to Europe. [Chouinard and Robbins reduced artificial aid to a minimum and relied as much as possible on free-climbing standards. In the mid-1960s they led the way in using leader-placed nut protection in lieu of pitons, an idea they had picked up from British climbers. Kauk followed in their footsteps until he began rap-bolting routes, a radical departure from the ground-up ethic of his predecessors.]