Among the improvements I had planned for my baby was the neat rocker-lever-actuated bolt holdback feature pioneered by PK in Lionheart's "Project X", but I discovered the '27A1 (or at least my 1975 Numrich model) already HAS a bolt holdback feature that I've never seen discussed and isn't mentioned in the original documentation that came with the gun. It's not hidden or anything, just sort of "hiding in plain sight".
Just forward of the large hole at the rear of the actuator slot (the hole through which the actuator knob is withdrawn for disassembly), is another smaller hole that matches the diameter of the actuator shaft just below the relieved area that rides in the actuator slot. If the bolt is drawn back so that the actuator knob aligns with this smaller hole, and pulled about 1/8" in an upward direction, the actuator shaft engages this hole perfectly and locks the bolt in the open position. To release the bolt, a slight rearward pressure is placed on the actuator knob while simultaneously pushing it back down to the point where it disengages the hole and is free to slide forward. It may take a little wiggling to get this to work easily if the sliding surfaces aren't smooth and lubricated, but it works!
I don't know if later Numrich production had this feature (mine is in the serial number 800 range), or whether the current Kahr models have it, but it seems to do the trick just fine. Makes both the rocker-lever holdback modification and/or the "third hand" accessory unnecessary for the '27A1. Can't understand why Numrich never documented this, not even with their drum magazines, since obviously it was designed for this purpose as well as for easier cleaning.
Damn! Now I've gone and ordered the parts, what the heck am I gonna use that fire selector lever for? Unless ...... !!! Oh well, I can dream, can't I?

'27A1 owners?