You can get the crimp tool online or possibly at jay car cheap. Alto my cheap set at home appears to be pretty good. size 16 will do 3mm and 4mm. My good set for work was about $120 from Ashdown Ingram in Welshpool and my propper DT multi size tool was about $500 but I use them everyday of my life so I I could justify the money but narva ones go for $40 online and do the same thing
{"embed-external":{"data":{"url":"https:\/\/cdn.ozvolvo.org\/uploads\/416\/MOQ75HNXT1SK.jpg","name":"20210603_181405.jpg","type":"image\/jpeg","size":8543161,"width":1440,"height":1920,"mediaID":20175,"dateInserted":"2021-06-03T10:20:26+00:00","insertUserID":2292,"foreignType":"embed","foreignID":2292,"embedType":"file","format":null,"bodyRaw":null},"loaderData":{"type":"file","file":[],"progressEventEmitter":{"listeners":[null]}}}}