Re-Installing Horseshoe Magnets
You will be orienting them (N) to (N) and (S) to (S). This is the WORST POSSIBLE configuration for horseshoe magnets ... but necessary for them to do their job (it’s a wonder they last as long as they do .. ha-ha).
DON’T LET THEM TOUCH ... either flanges .... (N) to (N) or (S) to (S). This is the best way to mount them ...
1)Screw the mounting plate to ONE magnet (the inner-most hole ... #8-32 screw) ... tighten.
2) Mount the bobbin into the installed magnet (outer-most hole ... # 6-32) ... This is when you should slip the grounding “donut” coming out of the bobbin into the #6-32 screw. This grounds the bobbin and magnets to the mounting plate ... ultimately dumping into the 1/4" jack. Tighten, but leave some “slack” ... a little distance between the bobbin and the magnet.
3) CAREFULLY slip the other magnet into place under the bobbin ... and screw it down.
THIS IS WHERE YOU NEED TO BE VERY CAREFULL NOT TO LET THEM TOUCH
4) Insert the other #6-32 screw and tighten down the bobbin.
5) Now go back and tighten up all the screws ...
The world won’t come to an end if they do make contact but it will degauss them some .. depending on the length of time they touch. Remember these are steel magnets and their coercivity (ease in demagin’) is much less than alnico, ferrites, etc ....