Home > Turrets + tools > 2.3mm drill bit

2.3mm drill bit

2.3mm drill bit - for drilling holes for the screwmounting turrets

When experimenting with the screwmount turrets, I was delighted to find that it's possible to get them to 'self-tap' into PTFE board. By using a 2.3mm hole, you do not need the M2.5 hardware to secure the turret on the underside. Instead, the pliable PTFE shapes itself around the screwmount turret's thread and this holds it in place.
      This is a 100% unofficial option! :) However, I've tested it thoroughly, and the turrets are definitely secure - they do not come out even with a 1kg transformer suspended from an upside-down board overnight. There's a huge benefit: you can add turrets to a board that's already in place - no need to remove it from the amp chassis and no need for access to the other side to add any fixing hardware. Just use the 2.3mm drill to make the hole. The PTFE swarf comes out in one strand with no mess. Then screw the turret into place. So it's an ideal way to add extra components to a board.
      Note: I have NOT tried this mounting technique with other types of board! The fibrous and laminated phenolic boards do not seem to be as suitable for this approach as the solid PTFE. Where the PTFE shapes itself around the turret's thread, I suspect these other types may splinter or break up. Not recommended.



With a 2.3mm hole, the screwmount turrets self-tap directly into PTFE board material

Price: £0.75
inc VAT
Quantity
NOTE: Amp Maker is closed for a whole year, reopening in Autumn 2019. See Home page for details.