I really can't see that void being much of an issue. Maybe grease would seep out, but I can't imagine it would break. I'd have to check mine, but I don't remember if there's a hole there or not. I do know mine has a tiny grease fitting on top of that pocket. The bearings, while smooth after cleaning, were full of gunk, as were the threads.
The spherical pocket may cause a little roughness, but I had the same issue with my grinding vise, and just used a hand drill and a ball end mill to make a more defined pocket. It's held up well under pretty rough use for years.
I've had mine for a few years, and I can't remember the seller, but I believe it was eBay.
The spherical pocket may cause a little roughness, but I had the same issue with my grinding vise, and just used a hand drill and a ball end mill to make a more defined pocket. It's held up well under pretty rough use for years.
I've had mine for a few years, and I can't remember the seller, but I believe it was eBay.
Full of ideas, but slow to produce parts