I like them best with the tennon.
The thing is these break pretty easily, with the tennon if they break, then the customer has to buy a complete new one handle and all but with the cap mounted into the handle, I can sell them a replacement cutter for under a buck, and in my area I think that saving will make a big difference, I like the ones with the tennon, but I have a heart for these old folks, I understand how a 8-10 dollar savings can help, I bought a hundred of these and I also ordered 20 of a heavier style, but it's going to be kind of difficult since the cap is rectangular but it's a good bit heavier duty tool
Which part breaks? The tennon or the handle in general?
Neither what breaks is the cutter it's self, they are quite hard and are only 3/64th thick at the cross section so you can imagine they are easy to break
The metal----some of them are made out of real cheap pot metal that is plated/painted----you know the deal it's just like pen kits.
That is totally bizarre, How on earth could pot metal be sharpened to cut ANY THING ???
As far as being made from pot metal Me thinks the poster has been smoking his front lawn?? in a metal pot?
99.99 % of all of the seam rippers sold in sewing notions stores hobby stores fabric stores and Wal-Mart are all made and marketed by the Dritz company, and are the same from all of the stores.
Here are some pictures so you can see what's going on,
seam ripper done with cover inverted and drilled into handle
seam ripper done with blade glued into a tennon on the handle (tennon turned to fit protective cap)
https://www.woodchuck-tools.com/images/uploads/seam tools/2a.jpg[img]
seam ripper with blade secured into handle (much safer and stronger)
[IMG]https://www.woodchuck-tools.com/images/uploads/seam tools/ripper.jpg
theses show the actual size and I tried to photo them as close to actual size as possible. So it's easy to see which way is best to mount the cutter glue it into a tennon, which actually is not the problem because the tennon is not the weak point, replacing the cutter is, or protecting the customer by being able to replace the cutter for under a buck or charge them 10 bucks for a new one, Me I'm not that money hungry, most of my customers know where my shop is and where I live,and since we only do 5 0r 6 shows a year they know where to find me, so let your consciousness be your guide.