[amazondean]

The thread is a little course. M20. The original volvo I believe was 3/4" unf. The pitch for that thread was 1.5mm. The pitch of M20 is 2.5mm so it will need a bit more grunt on the handle to move hubs. But it is the style of puller and strength of puller that will eventualy shift the drum. I have used other similar pullers with a finer thread and the last one i had i totaly destroyed the puller trying to get the drum off. I got that mad that the drum would not come off ,I ended up wacking the puller with a sledge hammer to try to get the drum off and eventualy buggered the puller. Thats why I made this one and the drum came off instantly using the extension pipe. It was almost sexual after all that grief. If it takes off I might try to make a finer thread but the advantage of a slightly courser thread is that it is much stronger.