Lisle 21700 Wrinkle Band Ring Compressor

I had one of these for over 20 years and finally had to replace it, not because it broke but because I loaned it out and it was never returned. This is a great product and I've used it for many years. Thumbs up 👍 on this product.

This worked great on my 295CC EZGO rebuild. Pretty stiff to tighten and loosen but does the job.

not bad ring compressor. worked the first time using it. its a little tricky using it, but managble. would recommend.

Worked in the 4.050 pistons in my 390. Made in USA. Price is right. Buy it.

Worked great on my 2.5” piston.

Too tall for small engines such as Briggs V Twin. I've seen videos of these that area bout half as tall. Another design is basically the exact size and is tapered. But I haven't found the right size and price. Getting past the briggs thin oil rings, seems to be the hardest part.

I had one of these for years, and used it every few. I must have loaned it to someone, because I couldn't find it when i needed it recently. No problem - I bought another. And it is exactly like my old one. It's a simple device, made to last - just be careful who you loan it to!

First, let me say that I rarely review products, so if I do, it's usually for a very good reason. I have built more engines than I can remember (I work as a Mercedes/Smart tech and rebuild engines on a regular basis both at work and as side jobs). I have good factory tools at work, but I got this to use at home (I used to have a better tool, but long story short, don't lend tools to people you can't trust to return them). This compressor is difficult to use and has sharp edges (I cut myself on it). More importantly, it is not completely/perfectly round, and even when oiled generously, it twists when pushing the piston out of it, creating a gap at the bottom potentially allowing the rings to expand before they enter the cylinder. I did several cylinders without issue, but eventually I guess the end of one of the oil control rings lined up with a gap in the tool. The oil rings are so thin/fragile and the compression rings and tool so tight that I didn't even notice an increased force, but the last 1/4 inch of an oil control ring was bent and pulled out of the groove (flat against the piston). I didn't notice anything was wrong until I had pushed the piston most of the way down in the cylinder. By that point, I had a significant score in the cylinder wall of a brand new Mercedes AMG engine block that had already been over-bored to the safe limit (and, of course, the ring was ruined). Maybe I can find a shop that can replace the cylinder sleeve, if the part is even available... If not, I'll be buying my customer another new AMG engine block (ridiculously expensive, even by Mercedes standards). Not to mention I now need to pay for a new custom forged piston and ring set. I saved a few dollars by buying this tool, but it cost me enough money to buy a modest new car (not to mention the several month delay to fix the situation will probably loose me a good customer).Perhaps this is a rare occurrence, and/or maybe I'm just incompetent (hard to believe with the factory training and years of experience I have, but who knows...). If not, this is a very poor tool, and a risk not worth taking.Even if my incident is unlikely, the tool is difficult/inconvenient to use and if yours is as sharp as mine, you can easily cut yourself pretty badly. There are much better options out there for not much more money.The best ring compressors are the engine specific ones that only fit one size. Assuming you want a more universal tool, I recommend getting a plier set such as the OTC 4838 set. I have no experience with that particular set, but will be buying it to replace this tool. (Even if I wanted to use this tool again, which I do not, I was rather upset when it failed, and there is not much left of it.)