I have a commodore 128 that is a PAL version and would like to convert it to NTSC. What is have done so far is replace the crystal with 14.3mhz one and replaced the video chip with a 8564R5CA. My question is apparently there is a jumper that need to be cut, I believe it is J1. The issue is that there is nothing to cut at that node (at least that i can see). Does anyone know what exactly I need to “cut” at node J1?