I use hundreds of slimlines through woodturningz yearly. Seriously, between my own small pen business and my students, easily 5-600 pens a year, easily. My other go to guy is Ernie at BearToothWoods.com. He has an OUTSTANDING selection of acrylics/acralesters/etc.. Wonderful person, Ernie and his wife are top notch people and love dealing with them. When I ran into a problem with trannies then one batch of pens had bad ink cartridges, woodturningz with no problems and or questions replaced them no charge and no shipping charge. With the bad ink cartridges, had a couple of students buy from PSI and had the same problem so must come from the same batch, but I do not know this for certain. HUT is another one we use from time to time.
God and family, the rest is icing on the cake.
I'm so far behind, I think I'm in first place.
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Host of the 2015 FAMILY WOODWORKING GATHERING