weak motor, blending combs jam trimmer head

This winter I grew a beard and mustache. I bought one of these at Walgreens and tried using it. The adjustable comb works ok but it can easily slip out of adjustment if you press too hard. The jawline blending combs don't work at all. They cause the trimmer head to jam up due to the way they attach to the cutting head. They clamp on and squeeze the cutter blades slightly. This, combined with the already weak motor in the trimmer, prevents the trimmer from starting. You can start the trimmer without a blending comb attached and them snap a comb on, but the trimmer will run at such reduced speed that it does a very poor job. Even tried a drop of oil on the blades per the instructions thinking this might make the cutters move more freely, but it didn't help much if at all. Back to Walgreens it goes.