The bore chamfer/deburring tool works great and I just got one from my brother last week and it actually takes that inside burr and removes it cleanly...
You can also get a brass bore cleaning brush at a gun shop or wal-mart in the archery,gun area in a single pack and put it in a battery drill and hold the footing tight and run the brush through several times on a low speed...It may get warm if you do it too long but it works great and preps the inside also...
Now what I liked better then the chamfer tool was I took a regular round pencil and cut it about 3 " and slid the footing onto the pencil and put the pencil in the drill chuck and took a reg. file and let it lay on an angle to chamfer the outside...
I then used that deburring side of the reamer/deburr tool and let it clean the inside then used that bristle brush..
A few folks have told me the 2117 won't fit good on a 15/35 or 35/55 gold tip but I beg to differ cause they slide very well on my 15/35 and 35/55 gold tips but I just need to glue them yet and I'm finished...