I'm kind of stumped as to why the Kalart Rangefinder arm on my Speed isn't contacting the bracket assembly on the focusing yoke properly, partly my fault for not paying attention when taking the arm off, did the bracket assembly that the arm contacts on the yoke come in different sizes ?

The angular location of the arm on the rangefinder shaft is critical to the accurate functioning of the rangefinder. It takes some trial and error to get it positioned correctly. It's a fiddly job, and you normally try not to remove the arm if you can. Correct positioning means that the rangefinder focusses on infinity when the focussing track is in the infinity position as defined by the focussing scale. The rangefinder arm position is the coarse adjustment for this; for fine adjustment the bracket on the bed has an eccentric which can be turned with a large screwdriver.

William, focusing scales can be moved. And they are lens specific.

That's true - you can adjust the position of the focussing scale as well. But the rangefinder arm still needs to be in approximately the correct angular position. If it is too far one way, then the rangefinder will not go to infinity when the track is moved all the way back into the body; if it is too far the other way, the rangefinder reaches the limit of its travel and won't let the arm come out far enough to engage the bracket on the focussing track (which appears to be Jim C.'s problem). Unfortunately, the bracket location is not adjustable.

I'm still confused to what Jim is asking. Is the arm too short? Is the arm contacting the yoke guide incorrectly? Something else?
If its arm mounting then the actuating arm should be 1/8 inch from the end of the actuating shaft. The end of the shaft has flats on many Kalarts. Make a tool from .030-.050 thick metal stock approximately 3/8 to 1/2 inch wide x 3 inch long. At one end cut a slot .085 inch wide x .2 inch long at a 45° angle in the end of the strip of metal.
With the yoke at the infinity position, be it fully retracted or .040 inch forward of fully retracted, lock the yoke position and retract the front standard fully. Pull the arm up to the bed guide with the arm in the slot of the eccentric and parallel to the body side and secure to the yoke guide with a twist tie or piece of fine wire. Now using the tool or a pair of 4 inch needle nose vise grips set to just firmly grip the rangefinder shaft without marring or slipping turn the shaft towards the camera back until you reach the end of travel then tighten the 3/32 arm set screw.
Now check rangefinder infinity without moving the yoke or eccentric.
Repeat the procedure raising the shaft position 6° (1 minute on a clock face) until infinity is near perfect to perfect. Remove the tie from the eccentric and arm. Adjust the eccentric as needed for coincidence at infinity.

Thanks for all the replies and sorry for the confusion, the Pacemaker I have is new to me
and my only point of reference is my Anniversary Graphic, so when I took the Pacemaker apart
to CLA / repair I did not take note of how far the range finder arm travels, and where it rests
inside the camera body, I assumed that it was like the Anniversary Graphic. Which it is not

In comparing it to my Anniversary Graphic the Pacemaker arm did not clear the bed brace
which the Anniversary arm does, if the focusing yoke is racked out all the way the range finder arm
protrudes from the Anniversary body, the Pacemaker was stopping behind the bed brace and not
travel past the brace which I assumed that it was supposed to do.
Setting the arm to where it did travel past the bed brace ( like the Anniv. ) is where I got into trouble,
the bends on the end of the arm did not line up with the infinity adjust cam. Which had me
thinking that the bracket was wrong ( the Pacemaker I got has a dubious lineage ) measuring the
Anniv's bracket width sort of confirmed it. Which led me to asking my question here.
Anyway ...
Bottom line is that the Anniv's and Pacemakers had different RF arm travels and placement,
the Pacemaker's arm is supposed "hug" the inside of the camera body and come to rest
at the back of the bed brace when the yoke is racked all the way out.