Very easy fix for this common fault, 5 minute no dismantling required, simply get an electric drill 2mm ish bit, drill through aluminium casting that the spindle runs through until the bit hits the spindle, approximately half way between the bottom link and the top where the wiper arm locates then apply a squirt of spray grease through the hole with the applicator pipe on the grease tin and whacko the diddle o .......... speedy wipers again, happy days.