WAP glow plugs

i just put in new glows ac60's price 152.00 canadian at napa. had a friend put them in and he did the rear passenger side from the top of the engine. layed out on the motor and reached down. did the two in the middle from the wheelwell. he worked on 6.5's at a dealership. shoulda heard his complaint when he did his 1st duramax ip. 9 hours, book says 4 so was paid 4. he complained and after arguing with the service manager was paid 5 more hours. 2nd pump took 7 hours and they only ever paid 4 hours. 3rd job went home sick. 4th time insisted on being paid for any hours spent on it or quit. worx for public transit now.