Crossbows use different arrows than other archery equipment and therefore are designed differently.
Bitzenburger have designed a jig for fletching crossbow bolts which features a nock receiver that accepts all 22/64 diameter shafts with most end caps.
The crossbow jig is indexed at 120 degrees for 3 fletch spacing.
It is made with the same die-cast alloy as their other products (no plastic).
The crossbow jig also includes a straight clamp for straight or offset fletching.