I don't know what the "strip" is or does. It was not defined and pictured. I always try to search pics on the internet . It may be a trim strip running left to right at the rear end of the wood.
I don't know if it is removable or not.
I guess these weird bolts hold down the strip.
Walter: I believe in this case I would not dwell on finding this bolt. I would do something that would enable a standard bolt. Something available everywhere. A stove bolt, a carriage bolt, a round head bolt. I don't think it NEEDS to be a flat head bolt. I don't believe it NEEDS to have a square shoulder under the head. So I would do one of the following:
1. Take off the strip.
2. Weld up the hole, at least at the top.
3. (A) Drill a thru hole only........ or (B) drill and countersink to match a standard countersink.
4. Use a standard round head carriage bolt. Grind off the corners of the square.
5. Use a standard flathead carriage bolt. Grind off the corners of the square.
No. 3A/4 being my preference.
Some folks here could find brass 1/4 square bar, insert it into the strip's square hole, and then weld around it to eliminate the "114 deg" countersink while maintaining the square hole in the strip. Then use a standard round head carriage bolt or countersink it for a standard flathead carriage bolt.
Last edited by bartamos; 07/12/2021 6:26 AM.
