( ( ( ( ( There ( is ( ( a piece ) ( of ( ( foam tape ) ( on ( ( the core ) ( of ( these solenoids ) ) ) ) ) ) ) ) ) , ) and ) ( it ( had ( ( ( become ( kind ( of sticky ) ) ) , ) ( ( preventing ( the solenoid ) ) ( from ( ( snapping back ) ( when ( power ( was removed ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (EX There)) (VP (VBZ is) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (NP (NN foam) (NN tape)) (PP (IN on) (NP (NP (DT the) (NN core)) (PP (IN of) (NP (DT these) (NNS solenoids)))))))))) (, ,) (CC and) (S (NP (PRP it)) (VP (VBD had) (VP (VBN become) (NP (NP (NN kind)) (PP (IN of) (NP (NNP sticky)))) (, ,) (S (VP (VBG preventing) (NP (DT the) (NN solenoid)) (PP (IN from) (S (VP (VBG snapping) (PRT (RP back)) (SBAR (WHADVP (WRB when)) (S (NP (NN power)) (VP (VBD was) (VP (VBN removed))))))))))))) (. .)))
There is a piece of foam tape on the core of these solenoids, and it had become kind of sticky, preventing the solenoid from snapping back when power was removed.
(ROOT (S (NP (DT An) (NN electormagnet)) (VP (VBZ is) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (NP (NN iron)) (PP (IN inside) (NP (DT a) (NN solenoid))))))) (. .)))