It is no secret that we, here at Nock Co., have mad love for Karas Kustoms. Their high quality, great customer service, and Dan make them a revolutionary leader of the machined pen world. Putting out affordable, Made in America products is something they have held to their entire existence.
It is only now that the brilliance and interchangeability has been seen fully. Due to the gracious pricing we as a community can afford multiple pens from them. A lot of us own a Bolt and a Retrakt. If you do, then you need to try out the hybrid ReBolt.
Unscrew the grip and tail sections from each other on the Bolt and Retrakt. Keeping the Parker sized refill from the Bolt.
Unscrew the Schmidt nock section from the Retrakt.
Dig through your drawer and find the piece of plastic tubing that Karas sends with their pens.
Slide the tube over the small post of the clicker. Leave it about 3/8" long, past the bottom of the post, so you have enough to play with when fitting your desire refill.
Assemble the pen and test fit the refill. It will be sticking out a good deal. With your eye or small ruler measure how far the refill is sticking out when deployed.
Take the nock back out and trim off what you measured. So, if you measure 1/8" too long, trim 1/8" off of the plastic tube.
Do this until the refill fully retracts. Then you have the ReBolt. The nice part about this mod is you then have a G2 Bolt with a Retrakt grip section as well.