I just started my leather journey and I am having a heck of a time punching through 5 oz veg tan leather with the Weaver leather 5 mm diamond stitching chisel set. When I watch videos people seem to make this not look like that big of a deal. I have a little mallet that was recommended for this task. I have also used these on 3 oz chrome tan leather and while it is a bit easier, it is still challenging. I get tired and I have to really pound on these chisels. Am I doing something wrong? Do I need better chisels? Is it just very difficult? I'm a powerlifter, I can't be this weak. lol
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Hey. It may be the way the prongs have been cut. If they aren't smooth, this can make it difficult to both hammer in and remove. If there is enough room, you can place a piece of fine grit sandpaper onto a thin piece of steel like a smaller ruler, this should allow you to get between and remove some of the roughness.
Feel free to upload an image so I can advise a little better. 5mm is pretty huge though, so the prongs may just be really thick making it hard to use.