I have run into a few people that have taken delivery of a new Heartland unit, Landmark & Big Horn, in late 2012 and during 2013 that have had issues with there Thetford toilet. The issue centers around the blade not snapping closed and the toilet not being able to hold water in the bowl. The specific model is Thetford model 42054 Style II High. Has any one else had this issue of the blade not forcefully closing with this specific Thetford model? Per Thetford, replacing the waste ball and drive arm corrects this issue. Please let me know if you have experienced this issue, firstname.lastname@example.org, and if Thetford has been of help. Thank you.