If you have to conduct auto repairs on your own BMW K 100 RT then it will always be a good plan to have a Workshop Manual for a reference should you need to know the right way to strip off a particular component including Drive Shaft and match it again appropriately.
BMW K 100 RT Workshop Manuals provides targeted diagnostic guides for the vehicle therefore if something is wrong it helps you work out what the issue is and easy methods to correct it. You can then determine if this can be achieved on your own or if ever the job is just too big you could make a reservation for your K 100 RT in with a local friendly mechanic.
BMW K 100 RT manual