how to rebuild a starter solenoid

{"cid":"91225280","title":"52-21981-004 14-26V DC 0280515 Solenoid Valve For 52-21981-001 series","imgUrl":"https:\/\/img.chinax.com\/nimg\/b7\/26\/fc77e3482ac3bede1d4dcb3f177a-200x200-1.jpg","attrs":{"Brand Name":"Original \/OEM \/ Aftermarket","Model Number":"52-21981-004 14-26V DC 0280515","Delivery Time":"3-7 Working Days","Part Number":"52-21981-004 14-26V DC 0280515","Packaging":"Branded \/ Neutral \/ Customized","Shipping":"Express \/ Sea freight \/ Land freight \/ Air freight","Trade Terms":"FOB\/ EXW\/ CIF\/ FIR \/DAP \/DDP","Product Name":"Solenoid Valve","MOQ":"1 Piece","Warranty":"6-12 Month","Engine Type":"Diesel","Condition":"100% Brand New","Application":"Construction Machinery, Heavy Duty Machinery, Agricultural Machinery, Excavator, Forklift, Marine, Mining, Bus, Truck, Generator, Etc","Customization":"Sample \/ Design \/ Drawing","Certificate":"ISO9001\/ IATF 16949\/ CE","Payment":"T\/T, Trade Assurance, Western Union, Credit Card","Certification":"ISO9001\/ IATF 16949\/ CE","Model Name":"For 52-21981-001 series","Advantage":"Professional service\/ Competitive price\/ Ready to Ship","Quality":"Genuine \/ OEM \/ Aftermarket"}}

{"cid":"91200038","title":"4I6448 Cylinder Liner 4I-6448 Piston Set 1154102 Piston Ring 115-4102 Sleves 2027167 Engine 202-7167","imgUrl":"https:\/\/img.chinax.com\/nimg\/e4\/f7\/627fc7d1880d4f75abfe43fd032f-200x200-1.jpg","attrs":{"Price":"Price negotiation","Brand Name":"","Model Number":"4I6448 Cylinder Liner 4I-6448","Minimum Order Quantity":"1","Delivery Time":"3-5","Certifiion":"685555212","Place of Origin":"China","Payment Terms":"T\/T, L\/C, Western Union","Supply Ability":"10","Packaging Details":"box","model OEM":"Piston Set 1154102 Piston Ring 115-4102 Sleves 2027167 Engine 202-7167","product name":"Piston Set 1154102 Piston Ring 115-4102 Sleves 2027167 Engine 202-7167","cross code":"Piston Set 1154102 Piston Ring 115-4102 Sleves 2027167 Engine 202-7167","other name":"Piston Set 1154102 Piston Ring 115-4102 Sleves 2027167 Engine 202-7167","sort":"Diesel Engine Assembly","appliion":"Engine Parts","applicable":"Excavator Parts","Weight":"XX kg."}}