Despite my best efforts to install the tank locking ring by alternating my hits around it with a drift, I could not get the ring rotated past the first notch. I even gave up and tried using the old slightly flatter ring to no avail.
So, after spending the afternoon getting nowhere, my evening was used up welding and machining out a tool similar Miller's special wrench.
I will try again this morning after finishing the tool.

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TWO Identical 2005 Liberty Sport CRDS
#1 CRD, 174,000 miles. Eco tune, Samco hoses. Mobil1 0-40w used since day one
#2 CRD 143,000 miles. Bought used (unknown history) with 100,000 miles. Samco hoses.
Eco tune, new rockers, and 5 volt glow plugs installed at 124,000 miles

I sometimes have luck with similar tight fits with a bit of spray silicone (not WD-40 or spray oil or some such) lube. It seems to make things slick for only a brief time and the residue seems to be absorbed into the fitting with not bad after effect but you do have to work quick.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

ya it was a PITA. I just kept hammering on it and then all of a sudden it just went.

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http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

OK, my spanner tool worked like a charm .
Also this time, I warmed up the rubber O-ring before assembly, in hindsight this would have helped a lot yesterday while trying to use the "gorilla" method.

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TWO Identical 2005 Liberty Sport CRDS
#1 CRD, 174,000 miles. Eco tune, Samco hoses. Mobil1 0-40w used since day one
#2 CRD 143,000 miles. Bought used (unknown history) with 100,000 miles. Samco hoses.
Eco tune, new rockers, and 5 volt glow plugs installed at 124,000 miles

Great to hear

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs