I bought my first Audio-Technica Safety Raiser(AT-6006 ) in 1980, for $19.98. It worked flawlessly, for over 30 years. Then, something apparently dried out and it began lifting more abruptly. I found two NOS/NIB pieces, on eBay, and bought both. Well worth the money, even at nearly six times the original price(each). It now appears to have been re-released, by AT(the AT6006R). From the outward appearance; the Douk is a Chinese knock-off. https://www.ebay.com/itm/Douk-Audio-Automatic-Tonearm-Lifter-Arm-Lift-For-LP-Turntable-Disc-Vinyl-Re... and here’s the new one, from AT: https://www.audio-technica.com/cms/accessories/398e4995e9bfe926/index.html It seems both companies have eliminated the lock-down/lift-defeat wire, of the original(not a big loss). ie: https://www.vinylengine.com/library/audio-technica/at6006-safety-raiser.shtml  Any of the three, would have plenty of room, between the arm mount and platter of a VPI Prime table.
btw: I found placing a tiny O-ring, on the AT6006’s cylinder, to save my correct height, went a long way to simplify the adjustments. Holding it both vertically and horizontally, exactly where I wanted, while tightening the screw, was just too big a pain, in the confined space between my particular arm and platter.
I used a Tru-lift on my LP12, worked for awhile, but tweaked the suspension and only worked if I kept adjusting it. Became a PITA. Then I got a Kuzma Stabi S, finally, with the aid of a VPI magic brick, I was able to get it mounted to the height needed and solidly. Still, I could not keep the trigger adjusted properly. Another PITA. So, I got a Little Frwd lifter. The magnet in the bottom was not strong enough to keep it positioned correctly. Argh !!  

I went to my local ACE hrdw and found a small pkg of 8 round magnets the perfect size of the base, and with a small sliver of 3M foil tape, to keep it from sliding off of the magnet. The Little Frwd works perfectly and stays in the proper position.

The Little Frwd's trigger is pre-set, the shaft is milled to a finer fitting tolerance. Very easy to adjust, even to my tapered Kuzma arm.

Glad that I stayed after getting a tonearm lifter. Now, that I have the Little Frwd positioned and working perfectly, I can start my 45 rpm project. That is; I have 52- 45 rpm albums that are great, but never played. Every 2, sometimes 3 songs, you need to get up and flip the record over. Hardly seems worth it.

My project, is to record the albums to DAT tapes. I am not sure why DAT didn't catch on, but for my purpose now, It is perfect. Recorded to DAT tapes. You can change to the song that you want to listen to quickly. There is no tape hiss, even without dolby b. Dare I say it, we know it is supposed to be impossible, but vinyl recorded to DAT tape, sounds better than the vinyl. As I get more through this project, I will probably have more to say about SQ. We will just have to wait and see.

Anybody that can add information or comments on this, is welcome to do so