As I said on another thread, the only ADA preamp I have with all its screws is my original MP2 bought new, I have only had the top off this unit a few times (EPROM upgrade, 3 x tube changes (1. SPAX7s not optimal); 2. NS LP Mullard 12AX7; 3. new NS LP Mullards)). I even went as far as always putting the screws back in their original holes (call me pedantic but don't call me late for dinner LoL). And even with all that care taken some wont tighten down properly anymore.
All my other units (3 x MP2, 2 x MB1 & 2 x MP1) have screws either missing or wont tighten (partially stripped).
With the MP2, the 3 screws that mount the lid to the heat sink (which is aluminum) strip and end up loose, and sometimes fall out and/or are hard to remove (which you have to, to take the top off). I can sort of live with "some" of the other screws being missing/loose but it's important that the heat sink mounts solidly to the top to dissipate heat (which MP2s make quite a bit of).
So I'm sure I'm not alone in this, what are good solutions fellow ADAers ?
Very slightly larger screws ? possibly the difference between metric and imperial can help here ?? as in the closest metric (almost) equivalent is just a little larger
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Some sort of "lock tight"
I've tried thread tape (on the MP2 heat sink screws), it's a pain to do and doesn't work