Maintenance

The heating filament has, under normal conditions, a very long lifetime unless bent

or otherwise mechanically damaged. However, to ensure reproducibility, the filament should regularly be examined visually (every week). If spot-like protrusions on the surface are noticed, or if the filament is bent, the filament should be exchanged. In this case only the filaments supplied by the manufacturer should be used. Handle the filaments carefully and do not bend them, they fit exactly!

When excessive heat is needed, change the filament!

To replace the heating filament:

1. Switch off the puller (MAINS) and disconnect the power cord.
2. Wait 5 minutes for the heating mechanism to cool down if it was in use.
3. Remove the four screws holding the lower part of the right-hand cover panel (to which the Perspex lid is attached, Fig. 1, 14).
4. Grasp the panel at the right-hand corner and remove it by pulling it up and towards yourself.
5. Give the spindle (Fig. 5, 1) a few turns using a screwdriver inserted in the slit (2) until the heating filament holder is in its most advanced position. Do not screw the spindle (1) out completely! Loosen the small black grub screw of the upper filament holder using the hexagonal key from the spare-parts box. Loosen the knurled screw of the lower filament holder.
6. Pull the filament out of the slots.
7. Insert the new filament as far as it will go into the slots. Partially (gently) tighten the screws . Adjust the horizontal and vertical position of the filament approximately by moving the upper and/or lower parts of the filament (the fine adjustment is described immediately following). Under no circumstances should the filament be adjusted by bending.
8. Tighten the screws by a final turn of 30 to 60 degrees and screw the metal cover back in place. Leave the heater in its advanced position (do not screw the spindle (1) completely out of its hole!)

Important: This cover prevents eye damage by flying glass splinters if a glass blank breaks. It must be in place before switching the power on. The puller may otherwise be seriously damaged if the heater unit is obstructed by the metal cover when moving back into position.

1. Switch on the puller (MAINS ). The heating unit will immediately return to its resting position. Insert a glass blank into the glass holders and press START. Immediately before the puller has moved the heating unit to its advanced position, switch the puller off (MAINS).
2. Remove the four screws holding the lower part of the right-hand cover panel (to which the Perspex lid is attached, Fig. 1, 14).
3. Give the spindle (Fig. 5, 1) a few turns using a screwdriver inserted in the slit (2) until the loop of the heating filament has reached the glass.
4. Carefully adjust the position of the filament as above. The glass tube should be centred precisely in the loop of the heating filament. Do not bend the heating filament!
5. Tighten the grub screws on the upper heating filament holder and tighten the knurled screw on the lower holder. For good contact fix the filament carefully! Tighten the knurled knob by hand. Finally, insert the hexagonal key as a lever into the round holes of the knob and turn the knob by 30-40 degrees!Do not overtighten the screw! Otherwise the wall of the clamp can be bent.
6. If the filament has been correctly inserted into its slots, the distance between the rear wall of the glass tubing and the filament will be correctly adjusted. Now screw the metal cover pane back in place and switch on the puller (MAINS). The heating unit will return to its resting position. On pressing BREAK (Fig. 1, 6) the glass holders will open and the glass blank can be removed.

1. Switch off and unplug the device.
2. Remove the four screws holding the right-hand cover panel (Fig. 1, 14) and lift the cover at the corner (Fig. 1, 15). Take care not to disturb the pulling rod (Fig. 1, 16) !
3. Lubricate the threaded spindle (Fig. 5, 1) with "Molykote" paste (in spare-parts box). To spread the paste turn the spindle using a screwdriver inserted into the slit (Fig. 5, 2). Leave the heater at about the middle of its excursion.
4. Replace the cover panel and the four screws and the cover of the right-hand glass holder. Tighten the black knurled screw. On switching on the puller (MAINS) the heater moves back to its rest position.

It is not necessary to clean the pulling rod for models with the Ser.N° beginning with 25…

1. Switch off and unplug the device.
2. Remove the four screws holding the cover (Fig. 1, 13), remove the cover.
3. Clean the four faces of the pulling rod using a cotton bud dampened with alcohol. It is particularly important to clean that section of the rod which runs past the six ball-bearings (Fig. 2, 2). Part of the rear face of the rod can only be reached through the hole (Fig. 5, 4) in the remaining vertical wall panel.
4. Test that the pulling rod runs freely by moving it manually. Place the cover and the four holding screws.