Well when first started cycling way back when it was often easier to get the gear than darts. Whom ever I bought from would never give up as many as I needed , so I had to reuse
occasionally and I never had a problem when I followed these procedures: after use, rinse the dart with alcohol, fill the cap with alcohol and draw a small dram into the syringe. Place back ing package or baggie and put in fridge. Be warned though the needles get dull quick, but if you can tolerate the pain(which aint so bad) it can be done. But now with on line ordering why the f*ck
would you want to reuse any part?