another option is to fit either one or two cylindrical tail pulleys whereby these have to consist of single , narrow rollers, freely rotating on a shaft as each roller has a different peripheral speed. a number of narrow rollers are more effective than fewer wide rollers. Cylindrical rollers generate a narrow, parallel transition gap to the following installation which allows the transportation of small and delicate goods. if both tail pulleys are cylindrical, the drive must take place on the return side (because of the loosely running rollers), preferably via a conical driving pulley.