Is bell clapper deformity something to worry about? or is it only a problem when torsion happens?

In bell clapper deformity testis hangs loose without attachment to Tunica vaginalis & is a common cause for a testicular torsion. If a child or adolescent presents with pain in testis it should be taken as testicle torsion until proven otherwise. Early intervention saves the testis. I am surprised that you are aware of the Bell flapper deformity without having torsion. Hope never get any problems

The Bell Clapper deformity becomes a significant concern if testicular torsion occurs. Bell Clapper Deformity is a congenital condition- gubemaculum, epididymis & testis don't anchor properly allowing testes to swing w/i scrotum & raise risk for twisting on spermatic cord. See illustration at http://www.meddean.luc.edu/lumen/MedEd/urology/bellclap.htm