Dear Cookieman:
Suggestion only, proceed gradually. As you know, the end grain works real good with stain, and if you could sort of remove some of the darker color, you might be happy.
There is a product that I use, sold under different labels, liquid sandpaper is one brand name. It's a blend of solvents used to prepare a surface for painting. Works real slick, has a cleaning effect, softens the finish.
Was it me, I'd get a small can for a couple bucks. You can't go wrong, cause it works for a lot of things. Hardware and paint stores carry this stuff. If you tried some in the barrel channel, to check it out it, no harm done to the outside finish.
If you want to tone down areas or lighten the color already on, this...might... work, it won't hurt anything. It certainly will not swell the wood, or damage it. It will remove the finish and have a...washing... effect on the stain. Overdoing things, if you get carried away, will not hurt the wood. And you still have other methods available. The same cannot be said of stripper.
Of course, if you resort to sanding, this stuff can prep the wood for the finish you use. Do use the proper cautions using this (a) rubber gloves (b) breath enough of the fumes and you won't care what color the wood is!
Lotsa luck, Woodbutcher