anyone can help before I call excalibur and batch, again. Bought a td355 micro last year. The end keeps loosening up. Accuracy gradually gets worse and then a shit will go 10 inches low and I check the end , sure enough loosened up again. Running out of patience. 1400 dollars you would think they had the bugs worked out. Anyways there a screw looking thins and a lock washer. I tighten them up and a dozen shots later the thing is loose again ..