Enlarging an Out-of-Round Chamber

[J2design]

Hi all - I'm looking for advice, tooling recommendations, etc. for essentially boring or redrilling a tobacco chamber. Typically, I chamfer the rims and sand the chamber of pipes in a similar state, but I would like to able to widen and true chambers which are in especially bad shape. I have access to a drill press and hand tools, no lathe. I am only interested in widening chambers where there is sufficient briar to reinforce the chamber walls. The pipe pictured has a nearly 1" diameter chamber, so I'm looking for large tooling recommendations for this task. I've looked at spoon bits, chucking reamers, etc. but was curious about others' experiences. Thanks!

 

[Chasing Embers]

You could bevel the rim.

Breathing Life into a Stunning Charatan Mountbatten Royal Made in London England 209 Pot

The Mountbatten Pot shape on the worktable came to me in December 2018 when my son, Josiah, came upon a lot of pipes for sale in an antique shop in St. Louis where he was studying. He sent me a pi…

thepipesteward.com

 

[xrundog]

That one is burned pretty bad. It also has a crack. I’ll try and save almost anything. That one would get discarded.
Something I’ve been using for mild out of round and knife hacked inner rims is a $9 cone shaped bracelet stand with the felt taken off and sand paper wrapped around the pointy end. It re-rounds an inner rim really well.

 

[ssjones]

That one is burned pretty bad. It also has a crack. I’ll try and save almost anything. That one would get discarded.
Something I’ve been using for mild out of round and knife hacked inner rims is a $9 cone shaped bracelet stand with the felt taken off and sand paper wrapped around the pointy end. It re-rounds an inner rim really well.

That's interesting - can you show me a picture of your tool? I'm missing something like that.