Does anyone know where to get replacement set and thumb screws for the WEN LL2156 21" saw? The only thing I found on the WEN website was the upper clamp which I think is identical to the lower clamp. I had heard that Pegas was developing the set and thumbs screws to fit the LL2156, but I don't know if they have done it yet. Mine are fine now, but I want an extra set on hand when/if I need them. Thanks.