The best machine i ever has(2) of them is the delta c-arm scroll saw huge needle bearings like a pencil eraser .I added a zerk grease fitting and Pumped them full of new grease .Who would have thought the circuit board would go before the bearings But i have on left as a back up for my 10 dewalts I'm afraid of machines like yours with a linking arm in the back.All chinese saws are like that and i wore out a dozen of them,just my 2 cents!