A mechanic I know had some home made versions of these, he just cut the bases off of some old junk cylinders.
Pull a cylinder, install a base plate & torque, move on to the next one.
There is a lycoming part number for them. I’ve seen them mentioned in one of the manuals. Lycoming one is horrendously expensive. I had to pull the cyl on a 66 hr engine. I didn’t want to risk anything. I read(online so take it with a grain of salt) the problem comes from pulling the cyl and then turning the prop you could spin a bearing. I’ll be using the plates from here out. Plus the the 66 hr engine I sent the nickel coated cyl back to the manufacture to hone. Figured I had no idea how long the cyl would be off for, can’t be good leaving it sit without the torque for long? Who knows.
There is a lycoming part number for them. I’ve seen them mentioned in one of the manuals. Lycoming one is horrendously expensive. I had to pull the cyl on a 66 hr engine. I didn’t want to risk anything. I read(online so take it with a grain of salt) the problem comes from pulling the cyl and then turning the prop you could spin a bearing. I’ll be using the plates from here out. Plus the the 66 hr engine I sent the nickel coated cyl back to the manufacture to hone. Figured I had no idea how long the cyl would be off for, can’t be good leaving it sit without the torque for long? Who knows.