Picture 1: The glued bag is clamped between 2 ply plates leaving only about 12mm (1/2") of the edge accessable
Picture 2: The welt (the strip glued around the edge joint) is checked for length. It is 40mm wide and long enough to fit all around the edge. The strip is folded along the centre and fold enhanced by some firm beating with a hammer
Picture 3: The glue (LA60 Latex Dipping Adhesive) is applied to a strip about 14mm or 16mm wide along the welt centred on the fold. Jackie uses a butter knife to apply the latex as it is easier to clean
Pictures 4 & 5: The latex glue is applied in a 6mm band around both sides and on the edge of the bag all round
Picture 9: The welt is placed along the edge of the bag making sure that the strip is central. The important thing is to ensure that the edge of the bag is firmly glued to the welt
Picture 10: The bag is removed from the clamping plates and the welt folded tightly around the joint. The joint is improved by hammering on a flat surface.
Pictures 11 & 12: The thread used for sewing is made from 8 lengths of single strand linen thread and waxed with cobbler's wax.
I am planning to do a video of the making of the thread. I was shown how to do this when I first started pipemaking.
Suppliers for the Bagmaking Materials used in the Jackie Boyce Video
Waltham Tannery The absolute best leather I have found. Ask for James Boston
Bagpipe hemp M11 non waxed This is used to make up the sewing thread for bags (8 strands) and bellows (6 strands) It is also excellent for wrapping the tenons for mounting the drones, the chanter and the blowpipe.
I think I have found the actual thread that Jackie Boyce uses. The notes from the making video gave a description of "LRAL080-NATRUL" and after much searching I found this one THRUM USUAL LRAL080-NATRUL