Blade Holder for RC72 Brush Cutter

I enjoy the ability to cut brush and small trees. I nicked the pipe the first day out. And needed to buy new blades which took 12 days to get. I then ordered several more blades at that time. The next break was that of this piece of equipment the blade holder. On taking it apart, the top only had less than an inch that the weld actually penetrated. I have pictures. And it was not penetrated at all on the bottom. The new one that you sent me I immediately welded the bottom into place and ground it flat. I’ve had no problems whatsoever with that part of the machine. However, I would like some new bolts, castle nuts and the washers for this Blade holder. I would be glad to send you the pictures I have. Of the Penetration of the Welds.
Perhaps the only other thing I would recommend is powder coating the blades, a bright color if they come off there be easier to find perhaps.
Thank you for Making a great machine affordable.