Shipments delays

Please be aware that we will not be shipping any product from May 15th through the end of May. We expect business to resume normally on June 1. We will try to ship all existing orders by that time, but appologize in advance if that cannot happen. Thank you for your continued support!

Shipments to Australia and New Zealand Updated January 2022

We have recently become aware of an International Mail Service Suspension for packages to Australia or New Zealand related to the COVID-19 pandemic. As a result of this suspension some (perhaps all) packages to these destinations are being returned to us as undeliverable. At least temporarily, we will not be accepting further orders to Australia or New Zealand. We will also be issuing refunds for recent orders to those destinations. This policy will change once the suspension is lifted. We apologize for this inconvenience.

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.