On the advice of Ron Zorn (not throwing you under the bus here, Ron), I was going to try and loosen a cap jewel with some application of naphtha in the form of Ronsonol lighter fluid. I've got an old can of Ronsonol here that clearly states that it contains naphtha, but as it is old, and the fluid level is low, I stopped by the local drugstore to grab a new bottle. Well the new bottle (which I ended up leaving on the shelf at the store) said nothing about containing naphtha. After returning home and doing a little searching on-line, I find that Zippo bought Ronson in 2010 and changed the formula so that it no longer contains naphtha. So, here's what I'd like to know... Ron - are you still using old bottles/old formula or have you successfully switched to the new formula? Or are you just buying a quart/gallon of naphtha from a paint store? Other brand? Do you use the VM&P Naphtha? http://www.lowes.com/pd_247184-78-QVM46_0__?productId=3162199 I also read that Coleman fuel (of which I have plenty) is colloquially called white gas but that it is essentially naphtha. Any hesitation on using this? I'd be interested in thoughts from more experienced users of this method before I go dunking pen parts...