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With those constraints, I'd consider a sealing/locking compound of some sort. Loctite has an excellent product line designed to do what you are working on. Google "Structural Bonding+Loctite".
 
I will take a closer look at this tomorrow when I have parts in hand to see if the O-ring method can be made to work.
 
What is the materiel of the drum? And what is the wall thickness?
 
Drum material is aluminum. I looked more closely at the O-ring idea and with a shaft in one hand, and the drum in the other, there is not enough material between the top edge of the feed hole, and the external edge of the drum to cut a relief for an O-ring. I've actually tried the Loc-Tite method before but found that most of the liquid is wiped away as you press the shaft into the drum. This leaves very little compound where you really need it. Also, the compound tends to get pressed into the feed holes which is not good. Maybe if I were to open the ID of the drum for more clearance, and then use the 3M bonding compound. That might be the trick. That would allow some compound to remain in place while the shaft is pressed back in.

Wall thickness of the drum is approximately .135"
 
Kawabuggy said:
Drum material is aluminum. I looked more closely at the O-ring idea and with a shaft in one hand, and the drum in the other, there is not enough material between the top edge of the feed hole, and the external edge of the drum to cut a relief for an O-ring. I've actually tried the Loc-Tite method before but found that most of the liquid is wiped away as you press the shaft into the drum. This leaves very little compound where you really need it. Also, the compound tends to get pressed into the feed holes which is not good. Maybe if I were to open the ID of the drum for more clearance, and then use the 3M bonding compound. That might be the trick. That would allow some compound to remain in place while the shaft is pressed back in.

Wall thickness of the drum is approximately .135"
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Can you fab a plate with oring groove on corner sealing to drum, plate and shaft and bolt to drum on OD?
Pics of your project may help with better solutions.
 
Nothing can be affixed to the external part of the drum. There is a thrust bearing that rides on the external edge of the drum right above where the feed holes intersect so nothing can stick up above the lip of the drum. I agree that pics may help at this stage.

I'm kind of trying to do too many things at once. I just bought my Jet 9X20 lathe and now I'm getting sidetracked trying to get it modified to a point that I can use it. I'm doing the 4 bolt compound mount, and also the "donut" upgrade as well as a QCTP.. So many mountains to conquer-yet so little time!
 
Kawabuggy said:
Nothing can be affixed to the external part of the drum. There is a thrust bearing that rides on the external edge of the drum right above where the feed holes intersect so nothing can stick up above the lip of the drum. I agree that pics may help at this stage.

I'm kind of trying to do too many things at once. I just bought my Jet 9X20 lathe and now I'm getting sidetracked trying to get it modified to a point that I can use it. I'm doing the 4 bolt compound mount, and also the "donut" upgrade as well as a QCTP.. So many mountains to conquer-yet so little time!
Click to expand...

There's a whole bunch of smart fellas here, I am sure with a few pics these guys can come up with a solution
 
You might try heating the drum to about 200deg slide the shaft in then cool it by running water over it.
 
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