Compatible Shank Castings Available Again

Paypal order processing issues have been corrected.

Change in Worldwide Shipping Policy

Due to a recent increase in the number of lost or undelivered packages by USPS and their worldwide partners, we have decided to discontinue shipments to countries not on the following list. If your country is not on this list and you place an online order. That order will be refunded in full, but no shipment will be made. Thank you for understanding.

We will accept orders from: United States of America, Canada, Australia, Austria, Belgium, Denmark, France, Germany, Greece, Greenland, Iceland, Ireland, Israel, Italy, Netherlands, New Zealand, Norway, Poland, Puerto Rico, Sweden, Switzerland, United Kingdom, Virgin Islands (British)

News on Investment Cast Products

Unfortunately, there is no anticipated return date for the investment cast products that are currently marked as out of stock on this site. I continue to encourage 3rd parties to take on manufacture of these products using designs now placed in the public domain.

Sergent Engineering at

Thanks to John Niemeyer for starting an email group for discussions regarding assembly, installation, and use of Sergent Engineering couplers! This group is a great resource to those who use (or are thinking of using) Sergent couplers. Join the group and get in on the fun! John has recently moved this group from Yahoo to based on the overwhelming preference expressed by the membership. Click here for the group page.