sluggish butt questions

[Tvak@AOL.COM]

Finally I got around to taking the action out of the Stieff upright (1890) 
and the first order of business was to figure out why the hammer return is so 
sluggish. So I took a hammer out of the action and held the flange, and the 
hammer will just stay suspended in the 9 o'clock position.  CLP did not 
improve the situation much, so I removed the pin and I could see some 
corrosion where the flange bushings were.  I replaced the old pin (size 20 
1/2) with a new pin of the same size and voila!  It's exactly the same, no 
improvement at all.  I tried a size 20 pin but it is too loose in the hammer 
butt.

I know these are pretty basic questions, but I want to do this the right way; 
 this is a pretty nice piano and has potential.  So...

Should I ream the bushings?  

Is there another (better?) way to shrink the bushings a bit to make this 20 
1/2 size pin looser?  

Will Goose Juice make a difference where CLP failed?

Is there a size 20 1/4 pin I don't know about?

Tell me I don't need to rebush, please, tell me I don't need to rebush.

This is an area (flanges/bushings) in which I am more ignorant than I'd like 
to be, which is why I buy these old pianos and fix'em up.  I am forced to 
solve problems with little monetary risk  (this piano cost me $100) and no 
client looking over my shoulder.  (Plus, it's alot of fun.)

Any advice is (always) appreciated.

Tom Sivak