Good afternoon. I wonder if anybody can help. I took delivery of a lovely Metallica a few days ago but am having problems with manual plunge. The attached video shows the problem (The file was too large for a SLO motion!) Strangely it’s ok on auto and it’s ok with a “light plunge” but this doesn’t always even get to the top. I have very limited ability to fix things but I have cleaned the plunger and springs, washers etc also the shooter lane but sadly still the same. So frustrating. Hope someone has a suggestion and thank you in advance