Probably no one can guarantee you this way ... if you buy something it will be 100% running for "its alleged lifespan" First of all, I would focus on whether this type does it .. from production ... just some the products are more imperfect ... then use Google.cz write a fault and follow the reviews ... Next ... make sure that the buckle is level and that the buckle drum is not too loose ... there is a possible mechanical failure ... Furthermore, I will probably find out only about ..service or complaints or home improvement of the third one, I do not recommend due to forfeiture of the guarantee ... but it is the fastest solution .... information for you please write resny type buckles ... ☢ ☠ ☣ ☠ ☣ ☠ ☣ ☠ ☢