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Pinblock fitting to plate flange is here: https://www.yunspianoservice.com/work/pinblock-for-steinway-l This is when the 5 layer pinblock is glued up and fitted to the plate flange. Use a transfer punch to mark tuning pins and webbing screws. Drill webbing screw pilot (body) holes through plate for accuracy. Be careful not to drill too deep, or it will be easily stripped when turning screws in. Set up drill press. That hose blows air out to cool down drill bit. Drilling into laminated maple can create a lot of heat. Tuning pins are tilled 5 to 7 degrees towards the front of piano, so the drill press is tilted this way, as well. When drilling for webbing screw holes, be cautious that the bit is in the center of pilot hole. Also till drill press back to 90 degrees before drilling any screws holes. The screws can be in different sizes. Pay attention to use the right drill bit for each screw size. After all the drilling, check if every hole is opened up. Clean drill bits thoroughly for the next person or use.
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