The NOCK OUT Lighted Nocks are designed to fit carbon bolts. Unfortunately, the design doesn't work well in aluminum.
If you have carbon shafts and the fit seems too loose, please us the Submit a Request button to contact a member of our Support Team. Keep in mind that the true test of the fit is to insert the bushing into the bolt and then insert the nock into the bushing. The nock may seem loose in the bushing prior to inserting into the bolt, but is snug in the bolt.
In your request, please identify the following:
1. Brand and name of the bolt (ie: Carbon Express Pile Driver)
2. Which bushing you are using