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Two cam followers have failed in the last 12 months.
The first was the one with the roller missing. The yoke where the roller shaft is located spread apart allowing the shaft to dislodge and the roller to drop into the sump!!

The other follower broke away from the bearing area and was dragged sideways so that it missed the tappet.

The cam followers look to be too light for the task although they have lasted for many years.
A quick fix was to install a used spare and also spot weld the shaft to prevent the yoke spreading apart.
The bearing appeared to only be located with soft solder and we bronzed the follower to the bearing to help secure it.

Has anyone had similar problems or any better methods of repairing the followers.

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Some folks with the early Eights that originally used the stamped follower levers have replaced them with the later forged levers - I don't know if that also can apply to the Sixes but the changeover to forged levers is covered in the Service Letters.

Looks like a poor repair job. Soldered in bushings are not going to stand up.

A few sets on Ebay right now, showing the original construction.

Later years went to a more durable forged arm.

http://www.ebay.com/itm/1927-8-Packard-Six-Cam-Rockers-Valve-Lifters-1-2-Set-/152348165979?hash=item2378a8875b:g:eDwAAMXQWzNSoStF&vxp=mtr

http://www.ebay.com/itm/1929-Packard-Std-8-Cam-Rockers-Valve-Lifters-Set-/201742945163?hash=item2ef8d10b8b:g:C8wAAOxydB1SoSyu&vxp=mtr

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Not sure if forged rocker arms can be fitted to your year, one source that has had sets of forged arms in the past:

http://julrichpackard.com/

I have no first-hand experience with the changeover but years back sold a dozen or more of the 1933 and newer style forged levers to various folks who did a changeover, on early 8 cylinder engines as I recall. The following image is from the Service Letters and the implication is that it can apply to both 6 and 8 cylinder motors.

By 1933 the 186671/672 had been superceded by 234584/585; I don't know of these are interchangeable or not. About 2 years ago Egge had indicated they were going to discontinue making the rollers and pins, I don't now whether they actually did so or not.

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I did not do the conversion, but my 28 526 has the cast arms.