I have taken my Brother 1500 apart many times to deep clean it. The housing is super easy to remove and put back on. One time a pin got in the reverse lever and fell right to a gear causing it to jam. I took the pin out and problem solved. One time I left extra spool of thread on the bobbin spindle and unwound half the spool on the hand crank! What a mess to remove. And just recently I heard a big pop and the needle wouldn't move up or down. I took the housing off and there was a big spring lodged in the gear. Hmmm I wonder where that came from. I took it out and the machine sewed just fine. A few minutes later I discovered where the spring came from. The reverse lever is attached to a spring. The spring popped off and flew all the way to the top of the machine. I put a rubber band around the lever and it works fine. I'll take it in to be repaired at some point. LOL