I just had a request for the same set up and alignment for a 1219 arm. The following outline/procedure is pretty well identical for all gimbal mounted tone arms including this arm. Some of the later Dual models will have a spring mounted horizontal (bottom) bearings, so there is no horizontal slack adjustment but otherwise very similar.
Here is my reply with reference to a 1219 parts:
The gimbal must have a very small amount of play.
The first step is to tighten 53 (left hand thread) onto 49 through 56. Make sure to align the zero on 49 with the arrow on the arm's bearing block. You might need to rotate and adjust 49 several times until the zero and the arrow stop precisely in line with the arm in a balanced (water level)incline. Once this alignment is correct, finger tighten 53.
Next, introduce 57 into the arm's bearing block --slooowly- to make sure you hit the centre of the bearing-not the sides--. Turn until 57 touches the bearing bottom (no play). Now slip on 58 and bring near but not tight on 57. Back off 57 from bearing block so that you just barely feel play in the bearing- about a 1/4 turn maybe less. Next snug tighten 58 onto 57 but hold position of 57. This must be carried out several times, until the play is just perceptible.
Horizontal bearing part 41 and 52 will be set the same way as 57 and 58.
Once these two are set, and the dial (49) is properly zeroed as explained above, you can make the arm's bearing test with a stamp and 0.5 p on the anti skate dial.
Here is the procedure to check both planes:
1. Set arm for zero tracking force and zero antiskate force.
2. Balance arm perfectly (perhaps without stylus for safety) .
3. * Place arm between platter and rest post, so it can descent. *
4. Drop a stamp on the head (over cartridge).
Arm must descent all the way for the 1200 series, most of the way for 1000 series with tk 12 headshells and at least lower somewhat for 1009, the lower, the better obviously...
If arm moves without hesitation then vertical bearings are ok.
*Note: for the 1219/1229/1229Q, there is a rubber bridge mounted left of and into the rest post, pivoting on a chrome shaft. This rubber bridge can be shifted/removed to enable a proper vertical test.
1. Balance arm as before (no stylus-no stamp...)
2. Apply 0.5 anti-skate on any side of the Anti Skate dial under the tone arm.
3. Bring arm towards center of record.
4. Let arm go.
Arm must return all the way back to rest post without hesitation.
If arm moves without hesitation, then horizontal bearings are ok.
That's it for the test.
Klaus Adlhoch, fmr. Assistant Service Manager,
Noresco -N.Q.I.-Dual of Canada,
Area of expertise: Tech Training and Consumer Service P.R.
Associated with Dual till Thompson era.
Favorite Duals: TG 12a, 1009, 721.