Light meter problem Nikkormat FT3 (maybe corroded wires)

The light meter did not work in this old Nikkormat FT3 because of a corroded wire and the battery contact. I I thought it was only bad in one end of the wire, but to my surprise it was also corroded in the other end on the circuit board and that's why there was no connection to the battery or the lighter meter. Here are some link's to different repair tool's: Japan Hobby Tool rubber cone: https://www.amazon.com/Japan-Vacuum-Camera-Opener-Repair/dp/B0013HFYKK/ref=pd_sbs_469_1?_encoding=UTF8&pd_rd_i=B0013HFYKK&pd_rd_r=RKSF5A4YKT9GV3E1382C&pd_rd_w=5H58m&pd_rd_wg=DBny2&psc=1&refRID=RKSF5A4YKT9GV3E1382C 18 different size rubber repair tool's: https://www.amazon.com/Sizes-Lens-Filter-Wrench-Rubber/dp/B00988D1BK/ref=pd_sbs_469_2?_encoding=UTF8&pd_rd_i=B00988D1BK&pd_rd_r=RKSF5A4YKT9GV3E1382C&pd_rd_w=5H58m&pd_rd_wg=DBny2&psc=1&refRID=RKSF5A4YKT9GV3E1382C Divider Caliper Wing Compass: https://www.amazon.co.uk/Divider-Caliper-Compass-Marking-Machinist/dp/B015CN9A8M You can also buy this set. Lens Repair Set with pointed, flat, half flat tips: https://www.amazon.com/dp/B00QRPWCN0/ref=psdc_3347581_t1_B00J5F6O92 JIS cross head screw driver's: https://www.amazon.com/Moody-Tools-58-0219-Chromium-Screwdriver/dp/B004PGO1T6/ref=pd_sim_421_6?_encoding=UTF8&pd_rd_i=B004PGO1T6&pd_rd_r=775KBDR03D8PMMEZWKFJ&pd_rd_w=ti7yC&pd_rd_wg=s2a40&psc=1&refRID=775KBDR03D8PMMEZWKFJ Or this set, that is the set I use: https://eustore.ifixit.com/en/Tools/Drivers-Wrenches/JIS-Driver-Set.html?utm_source=iFixit&utm_campaign=Referral&utm_medium=modal&utm_content=145115 Lens cleaning wipes (PEC-PAD): https://www.amazon.com/dp/B0161VIZZ8/ref=sspa_dk_detail_3?psc=1&pd_rd_i=B0161VIZZ8&pd_rd_wg=ZTxxY&pd_rd_r=RNY8S6Q1V5K18K3F61VZ&pd_rd_w=2c1Oy

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