Squeeze some of the filler into the gap between the glass and lead came on both sides of the window, taking care not to apply too much pressure, which could distort the window.
Llenwch y bwlch i gyd â morter calch wedi'i gymysgu ag agregau garw, gan adael y cymysgedd rhyw ½ i ¾” (10-15mm) yn ôl o wyneb allanol ffrâm y ffenestr.