Topic: Coil spring compressor failure

[WT8095]

It was made in Taiwan and the ATR pulled out the threads in the bottom block.

The threads are ACME (square) threads, which is good. Standard 60 degree threads should not be used in a high load/safety application like this. The threads in the nut stripped completely out, indicating that an insufficiently hard grade of steel was used, or possibly the heat from welding the assembly together annealed the nut and thus weakened the threads. I would be wary of any puller with a welded assembly.

[67gtasanjose]

The threads are ACME...

I've watched too many Roadrunner cartoons to trust anything from ACME, sorry.

[jwc66k]

That's "ACME Road", the other is "ACME Screw", although they may be one in the same.

[Bossbill]

I've built a few spring compressors, but never liked them much. I don't trust the all-thread versions since I have no idea who manufactured it and what grade it might be.
Like the others you can come across the Snap-on versions which are just designed and built so well all the others I built are now in the parts bin.

[70cj428]

The nice part about the Snap On compressor is that you can use it like you did in the picture to remove the spring, or if your just servicing the upper arm / spring saddle you can just take out the shock, drop the hook side thru the shock hole, then slide the fork over the rod and lay it on top of the tower. It will pull the spring up into the tower and you can service the arm. That compressor, coupled with an air gun makes the job a breeze ....