Progress Machine & Tool are located in LA, their address is
:Progress Machine & Tool
645 So. Olive St.
Los Angeles CA 90014
They show the following 3 hammer handpieces in their catalog.
Both are available with or without the duplex spring. The prices
shown are with the duplex spring.
Foredom #15D $105.00
Badeco #217RL $185.00
Progress are good folks to do business with, I’ve never been