
All is not lost! It is possible to repair high-performance engines with damaged block threads and cylinder heads with damaged spark-plug holes.
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Amazon.co.uk
5.0
£29.50
Qnkaa 151pcs Thread Repair Kit Helicoil Insert Sleeves Metric M5 M6 M8 M10 M12 Stainless Steel Tap Drill
-10%

Amazon.co.uk
5.0
£34.82 £38.69
FOURROBBER 131PCS Thread Repair Kit, HSS Drill Helicoil Repair Kit SAE&Metric M5 M6 M8 M10 M12 Kit

Amazon.co.uk
4.0
£29.50
151pcs Thread Repair Kit Helicoil Insert Sleeves Metric M5 M6 M8 M10 M12 Stainless Steel Tap Drill