There is a weird little screw on my Schneider SA XL 5,6/58

[Alan Klein]

I used a special spanner tool to tighten the lens to the board after removing this screw. The lens has to be tight to prevent slippage. The tool helps. The tool works on a number of shutter types and sizes.
https://www.bhphotovideo.com/c/produ...ng_Wrench.html

[Bob Salomon]

I used a special spanner tool to tighten the lens to the board after removing this screw. The lens has to be tight to prevent slippage. The tool helps. The tool works on a number of shutter types and sizes.
https://www.bhphotovideo.com/c/produ...ng_Wrench.html

But if you had gotten the Rodenstock one it would also work with 3 size shutters. This one doesn’t.

[Alan Klein]

But if you had gotten the Rodenstock one it would also work with 3 size shutters. This one doesn’t.

I didn't need the No. 3. I also didn't like the little nibs that tighten the lens. They look like they'll break or bend compared to the Toyo I bought. Maybe someone can comment on the strength of the Rodenstock. The Toyo I used seemed pretty strong.

Toyo https://www.bhphotovideo.com/c/produ...ng_Wrench.html
Rodenstock https://www.ebay.com/itm/133872020620

[Bob Salomon]

I didn't need the No. 3. I also didn't like the little nibs that tighten the lens. They look like they'll break or bend compared to the Toyo I bought. Maybe someone can comment on the strength of the Rodenstock. The Toyo I used seemed pretty strong.

Toyo https://www.bhphotovideo.com/c/produ...ng_Wrench.html
Rodenstock https://www.ebay.com/itm/133872020620

The reason there is a Rodenstock lens wrench available to users is because we saw the factory technicians and engineers using them and asked the factory to make it a product. Same time we asked them to make their microfiber lens cleaning cloths a product.
There is no way you can break those prongs on that stainless steel lens wrench.