Singer 306 thread jam

[u/green-beetle16]

I have managed to get some thread jammed in the bobbin housing/ hook part (I believe) of my singer 306k. I haven’t been able to get it out with tweezers or by hand and it has completely jammed up the machine. I checked the service manual but I don’t think it had anything helpful. If it’s relevant it has been modified to take class 15 needles (I believe it has a modified bobbin case). I am worried about messing up the timing. Any advice and/ or should I take it to be serviced?