Browse Forums General Discussion Re: what kind of screw is this? (70's build) 3Dec 29, 2022 10:31 am Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 Re: what kind of screw is this? (70's build) 6Dec 29, 2022 12:13 pm ![]() ![]() Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ I am trying to remove security bars from window to paint them, removed the nut of this retaining screw, but there are two both ends of the grille, so it wont actually come off. Are these screws that also themselves screw in? Is it removable or designed not to be removed? thanks! Dan Hi Dan. They are dynabolts like below. As you tighten the nut the thread shaft with the wedged end pulls into the sleeve and locks in the wall. Once you take the nut off the threaded section is still wedged in with the sleeve. They can be difficult to remove. Best bet is to take off all the nuts and remove the security screen. To remove the dynabolts you have to push the shaft back into the wall enough to loosen the wedge and then try and pull the sleeve and the thread at the same time so the wedge doesn't grab again. Problem is the sleeve is normally completely in the wall so there's nothing to grab. I'd try and reinstall using the same fixings. Just remove screen, paint and reinstall again. If that doesn't work try what I've said above, worst case scenario you have to drill new holes and install new fixings. ***** Appreciate the detailed reply Chippy at least I understand now! Challenge will be, the security screen wont come off as there are two dynabolts either side, so i guess the only option is to try hack saw them off? but will be impossible to get a saw in behind the grille. I think was designed to never be taken off! cheers Dan Hoping someone can help. It's a 30 year old brick veneer house with a negative slope from the street. There's no effective drainage here except for a rubble pit at the… 0 1414 Thank you so much everyone. This all makes a lot of sense. I guess when you talk to a builder who butters up everything to look very polished, you get to start believing… 7 23277 |