its not a fissure its a fulcrum lol.I have seen this before proper shimming would have prevented this.sorry bad install

NO NO NO NO
electric parts cleaner works every time you can get at auto zone ( spray wipe )

angle grinder
square
tape
whiteout pen
no seams
sawhorse x4
skill

Items built =ing $8000.00 Rail Saw Slab Table that tilts one man can operate boom for forklift water collection system slab dolly for installing large pieces fab tables sink run savers (bars)(makeshift omni rails) seam setter A-frames work seperation shields (so each man does not have to worry about...

yes that was how i started i made my first saw for $600 and is still in service today.Its a simple design that cuts straight,lightweight ,easy to transport if nessesary.ill have to take a pic and post.If you have the nack for stone work you dont need a bunch of overbuilt equipment.