I ordered some new hi-lifts from J-Thomas last week....... just went to sharpen (file) them before installing them and I noticed one seemed to be bent or warped..... so I took all of them (6) and put them flat on my table saw table (flat, machined surface), and 5 of the 6 are warped !!!!....... the blade is higher in the center, at the hole, than the ends..... one is 1/4" difference !!!!! WTH?!? I called J-thomas right away and left a message for the salesperson I dealt with (they were closed) stating my dis-satisfaction, and that I would like all 6 picked up for return and credited, and no, I don't want them replaced! I ordered blades from them last season, and they were different...... these are the correct length and thickness, but have 3 holes..... OEM and the replacements I got last year had single hole. I guess they changed suppliers..... now so will I ! Anyone else ever had this problem???? Any other recommendations on replacement blade suppliers?? Thanks for listening to me and for any suggestions.