For blade tip retention I glue the tip using E-6000 glue. In the past, I've wrapped the tip with shipping tape. I've started to use chair foot protectors on top of the tips.
For round tips, I just press the protector onto the tip then wrap a layer of tape around the side of the protector and blade.
For pointed tips, I cut the top off the protector, leaving a band. I then place the band, top side down over the blade until the seam for the blade and tip are in the middle of the band (and yes, the blade is cracked and needs to be replaced).