Autozone sells the sparkplug adapter kits also.
Just any little magnet will work, all it is for is to pick the keepers out of the grooves since they are fairly small.
Duct tape?? What for?
It is a fairly simple job, Just takes time.

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Thanks, Nels
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86 300E
93 W250 4X4 Cummins Power
72 F250 Highboy
89 S-10 408ci BBC
custom V Four Chopper
77 Peterbilt 352
83 Jeep CJ-5