Check It Products Low Pressure Bolt - Aluminum low pressure bolt for the Autococker. 45 Degree air transfer passage to increase effieciency. Timing hole drilled through bolt for easy timing without bolt removal. Bolt shaft includes and extra o-ring for better gliding with less friction and scraping. Available for both pre 2000 and the new 2000 model back blocks.
The Check It Products Low Pressure Bolt is older, so while it may be available used and in a few cases new, it is not commonly available anymore.