Found this write-up on Richard's website
And can tell you I've experienced firsthand the clogging issues he mentions in my trusty Pilot Custom 823 with several versions of Noodler's ink. I really want to like Noodler's but can ill afford to keep running into issues or, worse, possibly destroy my feed as Richard mentions is possible. I ordered some Waterman and Diamine inks in the hope they'll perform much better. According to several write-ups, these two brands are supposed to be the two better ones in terms of general purpose inks with good flow properties.
Anyone else have this occur to them? Any other ink recommendations?