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Pre-assembled base and bearings    
(A) 1 steel base (M) 2 springs
(B) 1 bearing block (N) 2 3mm grub screws - long
(C) 2 ball race bearings (O) 4 rubber feet
(D) 1 steel pivot pin (P) 1 plastic paddle
(E) 1 main brass arm (Q) 1 centre stop pillar
  3 3mm screws (R) 1 3mm grub screw - short
  2 3mm washers   2 4mm screws - long
  2 3mm solder tags   3 4mm washers
  1 3mm grub screw   2 4mm solder tags

  4 3mm screws - short
(F) 2 contact adjusting pillars   5 3mm washers
(G) 2 brass copper tipped screws   2 brass screws
(H) 2 knurled locking nuts   1 4mm screw - short
(I) 4 plastic insulators   1 cable clamp
(J) 2 copper tipped brass arms   1 length of cable
(K) 2 knurled spring adjusters   2 3mm brass nuts
(L) 1 spring adjusting stud   1 allen key

 Read all the instructions before starting the assembly.

1. On the steel base fit the four rubber feet onto the steel base using the four 3mm screws and washers.

2. On the base assembly fit the spring tension stud (L) into the main arm so that the stud protrudes equally from each side. When in position secure with the shortest of the 3mm grub screws.

3. Fit the two contact arms (J) so the contacts are positioned outwards, passing the arm over the spring tension stud and locating the pin in the contact arm into the slot in the main arm. Secure using the springs (M) and the spring adjusting nuts (K).

4. Fit the centre stop pillar (0) using a 3mm screw and washer

5. Fit the two contact screws (G) together with the locking nuts (H) into the pillars (F) so that the contacts protrude by not more than 1/8fl. Ensure the screws are assembled from the correct side so the locking nut seats into the machined flat in the pillar.

6. Fit the contacts and pillar assemblies onto the base using the four plastic insulating spacers (I) and the two long 4mm screws, having first placed a solder tag and washer under the screw heads. Before tightening the screws align the contacts in the pillars with the contacts on the moving arms. Vertical adjustment is carried out by slackening the grub screw in the end of the main arm using the allen key supplied. Slide the arm (E) up or down on the pivot pin and, when the contacts are correctly aligned, re-tighten the grub screw, It is advisable to make this adjustment at this stage as access to the grub screw in the main arm is not possible with the paddle (F) fitted.

7. Fit the paddle (F) onto the main arm using the two brass screws.

8. Cut back the outer protection on the length of cable by approximately 3” then secure on the underside of the base with the cable clamp using the 4mm screw and washer.

9. Make the three solder connections, one to each of the contact pillar solder tags and one to the bearing block solder tag, together with one end of a 1” length of the braided wire supplied. Solder the other end of the braided wire to the pivot pin solder tag.

10. Finally start the two 3mm grub screws and nuts (N) into the contact arms. At this stage do not allow them to protrude on the inside of the brass arm.

Setting Up
Using the Allen key supplied screw each of the 3mm grub screws in arms (J) inwards a little at a time so that when the paddle is moved from side to side the contact arms immediately respond with no play.

(1) If screws are too far out there will be play between the contact arms and main arm.
(2) If the screws are too far in there will be play between the contact arms and the centre pillar.
Keep adjusting the grub screws from each side until correct then tighten the locking nuts. Finally adjust the contact gaps and spring tensions to your requirements.


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